Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06b2e082b8982ee…

MALICIOUS

PDF

79.5 KB Created: 2021-05-05 11:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e4303d4691701edab688d3d7a28bf56b SHA-1: 18c132a8f6b2457e92ab8b65a76bde8dd0b70549 SHA-256: c06b2e082b8982ee40238f7f63c24caf67aa250e3dff9c7cf65702235ce5c37f
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 0.9990

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://midufefew.ru/strik?utm_term=other+word+to+say+stressed+out PDF link annotation
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/2b5f474234503c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371023/normal_602d6603e1eae.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/cifNjhx/rebel_racing_hack_iosgods.pdfIn PDF document text
    • https://zalirojojates.weebly.com/uploads/1/3/4/6/134606979/lobire-gomofavavuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/gfRLege/sha256_cert_fingerprints_android_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/jRjfjfT/libiwosisajaw.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hheajas/75494411611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6061afab31515.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/1648504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe0442de29fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_605fbfc2f0e72.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/jgGpHjj/fine_chromatic_tuner_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_6012098f0f961.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/vujam-guvugelamopizi-xefezebarid.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/ffb8fda8-2f88-4a01-8a8d-e0b80ddc67dc/can_police_arrest_without_proof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde5b421-da6b-416a-8175-a1e1254932d9/wordpress_free_tutorial_videos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0aa9b39-89a1-45fa-aadb-f640ef93e9f7/homelite_string_trimmer_saw_blade_attachment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ac5a5f-006a-4cbb-a267-ae4a887e36ac/netgear_ac1600_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec50ed0-4abd-425f-8568-720fc8a01dc1/jifoxegiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b96abd3-befe-4378-b37c-b53d6b10d7b4/the_castle_kafka_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b2e07c-0b88-4512-ae27-c46fa3061f92/xitupowuxutim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842f54f6-8f1c-4100-8439-84435bad9bc3/circular_and_satellite_motion_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b8f540-a07e-4e89-90d2-fb060281577f/95300303255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd4a4e2-68d9-48c4-bd4b-e213461dcb9a/mackie_profx8v2_mixer_with_usb_and_effects.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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 4832 bytes
SHA-256: 10dec8bcf0a6428973782ac3b9e4f2e61c4a4178be2f103402223cd7aa95f335
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 10428 bytes
SHA-256: 7ec301edd6c50863fed3aa52a93beac8a1ad8ce938ef3d2de68b4d71332bed73
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361