Malicious PDF — malware analysis report

Static analysis result for SHA-256 b151bd5f45ed5f1a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 08:05:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1431de5a34bebe6cbfeb1c2cc6c1667 SHA-1: 5cc450b6ac10a102a4e7fcca861b0d0db7f91df5 SHA-256: b151bd5f45ed5f1a44eb357eed1ebb8c61cf6889d5e9435737bea20b3ee40505
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a significant number pointing to SEO-optimized PDF documents on external sites, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to drive traffic to malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=vtech+smart+shots+sports+center+price
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/7124103.pdf
    • http://rolapisi.scienceontheweb.net/mekoferawegolowo.pdf
    • http://bipowilago.mywebcommunity.org/63967041875.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/799534.pdf
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/tisugesetigujodog.pdf
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/zexukilemumesupeji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d21b09b-54c1-48ae-85ae-48eeb5ca8723/98022610667.pdf
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_b4b830b44e1d418c8885bb943d5a19ee.pdf?index=true
    • http://fumebuz.rf.gd/brookstone_clock_instructions.pdf
    • https://uploads.strikinglycdn.com/files/d65edc7b-1168-4d2b-b332-e8d9c1303c60/vanerepifaguz.pdf
    • http://kixelekiteduxaz.rf.gd/filehippo_itunes_free.pdf
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_4345c17ef8a44332a7c316b0304bdb63.pdf?index=true
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_b5154215819440ee96071966882ae844.pdf?index=true
    • http://zipokuxabatu.rf.gd/hoover_windtunnel_problems.pdf
    • https://uploads.strikinglycdn.com/files/852acd01-d06e-4749-b3f5-be68874c9f46/45670687227.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac9.bin
2aa8155d1273f0d2c86c798ee2ffc21c97c604bc40f00c843d88a66e74cc1b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 5104 bytes
font_01_sfnt_off0000fbfc.bin
b48d5561d4db7bd38a71ff86b9d0da47842c22b6224a7956ebdae175043d6f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 12020 bytes

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