Malicious PDF — malware analysis report

Static analysis result for SHA-256 742190f640a56ee6…

MALICIOUS

PDF

88.9 KB Created: 2021-03-09 16:33:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 42a10342383d77fe09608432cb41f096 SHA-1: efdbf3b6dbd57e83076c7b4e52f52484784c652f SHA-256: 742190f640a56ee6e103a19a7265e688673425a7c50b374f8213bfab61b7a752
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fokemale.ru/strik?utm_term=que+es+recoleccion+de+datos+estadistica PDF link annotation
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/nutefubudizaroj.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/0KlWKha/12145343226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_5fdc33231b63f.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/Vghjfji/2196230067.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/f745e33ac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_600b95e61c0fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuputid/NThjgfJ/draw_climber_free_arcade_run_games.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/ehblESF/tajirewop.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/5586580.pdfIn PDF document text
    • https://tibagikusutugox.weebly.com/uploads/1/3/0/7/130775046/4aae2a5.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/JjiECDu/change_wifi_to_private_network_windows_8.pdfIn PDF document text
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/fd5f5665e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489722/normal_6001fd6b66ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_60045abf7d97e.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://uploads.strikinglycdn.com/files/15ce4769-74ab-4635-8ab4-447c63ab4d4a/4027381756.pdfIn PDF document text
    • http://patikogoxuxit.epizy.com/91631342961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a5cbf7d-e904-4d2e-8620-f64cb7a395b6/65328952746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de170400-5c7e-49cf-81e4-c4edadb1b3e5/fisolilijudelofapoxatubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a946a4-b531-4ea5-9b61-fd871e1bebec/motorola_talkabout_t600_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d70410-f372-4acb-a02d-5d78c69942d8/jozimib.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/bp_reference_standards_coa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6375b24d-cd74-4988-b2d0-727d3ab784f4/basic_physics_concepts_for_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1ce54f-1eaf-4e8c-bd77-fb2e60fe1be6/wisitibefomapogul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74d22ae-ce26-43f4-8c37-955c6807ab8b/kosadazokosoxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269386fc-8c18-44be-9f8b-876f03d81cd3/78632254615.pdfIn PDF document text
    • http://kurejewupom.rf.gd/17148958910.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 4876 bytes
SHA-256: 67e68ff246f8fdc62ffaa88e50efbfc86ccc9c054818c1fd10635e704b9b6df8
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 11884 bytes
SHA-256: 2d881edaed642c36acc70e45502205db9044067b8c65aa79a7fc65d21945349c
font_02_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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