Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8446c8be3cfe5c…

MALICIOUS

PDF

67.9 KB Created: 2020-12-02 14:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f870ee8657af17d7d88047b0f51d3a5c SHA-1: d9d704ed634cd3be45884b846b8d52c86489fe7f SHA-256: 1f8446c8be3cfe5c88974141ea0586dcd8a42986ca39b0234dd439a072b33e9c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/strik?utm_term=osha+approved+scaffold+planks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5fad865320f9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490128/normal_5fc68196dc6e7.pdfIn PDF document text
    • https://lekodapodigix.weebly.com/uploads/1/3/4/5/134500142/xulukinoxitesu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazolu/ar_aging_report_quickbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4ed4a0-71fa-410e-bea2-aeb279570d54/rejipikuzexefoforeniwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ed1b70-44a8-43c0-8565-9ce34e8bb2c5/xobotekufikel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26d9f05-4e28-46eb-8926-4b07d3ae3e2b/nusobarunududonajux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078d383b-e18b-40ff-ab47-1faf4528be21/69167628960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a79536-acb7-4b55-b40a-ab0765f80e90/bimenudugovuxuvekijefugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864303b8-fe88-4536-8403-ed193a96c4ff/avengers_infinity_war_watch_online_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/affairs_cloud_current_affairs_april_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/nuzolofemaresosejab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24670f9c-4025-4697-89eb-2b6b5cb4209b/focus_on_the_family_voter_guide_2019.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 5392 bytes
SHA-256: c31b26acc1660d2f74e4e2eeb8a184aa76f7ce2d3e2cd60c87d0d68f9549ead4
font_01_sfnt_off0000e060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE060 10180 bytes
SHA-256: 483ff29916966e45a145f3e53262ab0f8f84ccab310243c03ba88a4d79b9c8ab

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