Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dfbc5bc557d108…

MALICIOUS

PDF

92.9 KB Created: 2021-03-14 04:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1f081ac74e588f57128ae5ae10ca6a63 SHA-1: 0f6f208a63014ec517bed6eaa702588451382fde SHA-256: b5dfbc5bc557d1083897ec16eb754260d96101ebba62f464ad09f3cc293a7dc0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=chronicles+of+darkness+vampire+pdf PDF link annotation
    • https://cdn.sqhk.co/fagiseregu/ieid0sT/xiwopujakatawif.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/wjjLijo/12558097641.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/jfzL6Dn/smash_hit_hack_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/gggjcha/reusable_hand_warmers_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/hjjh4TX/strange_things_you_didn_t_know.pdfIn PDF document text
    • https://cdn.sqhk.co/xodokopav/jhhggjh/xmeye_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/h0xihhg/call_of_duty_mobile_garena_mac_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/i9ZbSgd/pavemix.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/raspberry_pi_compatible_with_arduino.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/LidhdYu/45947764329.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/jd37ggQ/56877448558.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/how_do_i_know_when_my_krups_waffle_maker_is_ready.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_c55b83e7a0644ec38c87063f64fffa2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4724703a-90c7-4ff5-af99-c78bb19d25dd/wagner_power_steamer_715_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac971c4-4816-43e5-b4dd-bfc80092dfc5/how_to_argue_with_a_cat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0f0724-8839-4228-abc5-8035e836d978/oster_pro_1200_plus_blender_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b27932-c432-41b4-9be1-f670084926c3/como_aprender_ingles_facil_y_rapido_en_casa_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704fd02c-e495-46e3-8bda-28cfe025cb91/how_to_qualify_for_navy_federal_credit_union.pdfIn PDF document text
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_11833e9bf75242c188b10b5dd77236c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d8a2f6-6f51-4a73-962a-048597dc045c/does_evening_primrose_induce_labour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e972e46-ce4d-479c-ad46-0e199a9270a4/where_can_i_watch_twilight_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df16cc6-434b-45f4-8e57-87d9b1204410/74515816111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1289da98-9e5b-464e-b9d7-c35b8ca3b4b0/tokiwupemi.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_aa3720150acc4bb0ae7f3e26e8b32696.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_132fa7b63c7b4a10b3581a38b0967df5.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_0d7d1323c2974cbea65a9e26469d3a6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23c7208-a3b4-475b-92a0-e61880db4553/waxomodixunilekegexasarew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 5908 bytes
SHA-256: d759a8bbc24d245f4b783b402df2d08734d7842f6efb7fa282ce1fb575741bd3
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 5248 bytes
SHA-256: f29ef3e7317d557fe65cfa22351c68f9abf3f0dbcfe491f943a25a0a6fa979bb
font_02_sfnt_off00012f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F62 11056 bytes
SHA-256: c58ef236c7a06ccc50a88d49dafc17a049f3c1c9abfe03ecf08f220e19fd9f81
font_03_sfnt_off0001554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3