Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfaff22d6192569…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 08:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea7639c4356104994a876761b232ba00 SHA-1: 94b2ea2d48183926eae9d7450fa32de0c85f00de SHA-256: acfaff22d6192569316077b9a159e1dd396062e6d75b4883cab6a0d8216e2c3d
186 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 0.9993

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://lozipotod.ru/award?keyword=jurnal+analytical+hierarchy+process+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485313/normal_5fc71984a06a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_601b29e6a2276.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/how_to_reset_timer_in_hitachi_ac_remoterjltv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fea03ec420fd.pdfIn PDF document text
    • http://mavitrade.com/33382707484aqb89.pdfIn PDF document text
    • http://lerob.info/828458631200snzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_602e7d2c88bc0.pdfIn PDF document text
    • http://storeeuro.info/47290790694bkz3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393754/normal_5fde86e35e71d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63418c63-a65b-47a5-b433-4a63d12f4b9a/77302998360.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_354340ea216541ec8ab4d752f3db79c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ea0c9d-9660-4eeb-9633-1e630aadb15d/70759401825.pdfIn PDF document text
    • http://gokixedotoj.epizy.com/3567514513.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_f0bb0cfa2e3c46e5adddf38fd11c76e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ddb0fec-8703-4a6f-9cdd-90ec6eaa7882/tecumseh_ohh60_oil_capacity.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_cb222c60c5b94e479fe776422977a6a0.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_bfcee8e19e384d5a9aa000c5495d71d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17b9413-b7da-43c1-bd98-dd4dd604c257/texurovikixobebesos.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_b6675ab2c00846369c0f47a93c8f19ec.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_05c81260115e42c7ad146fa216590d62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcd26af-853c-4f91-bd61-3ad542fe60ec/introduction_to_law_for_paralegals.pdfIn PDF document text
    • http://pudofifomabevin.rf.gd/kepercayaan_animisme.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_10fde40500df4161a96ab559409df7c6.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_a15d2b50970c42629b5d721333e7b766.pdf?index=trueIn PDF document text
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_6dc6124a93954d29b84b346c07b9928a.pdf?index=trueIn 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_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 5336 bytes
SHA-256: 960ec06a1a81bdc080fec55b18b7fa5d3e892b74df3e1420281bde54c98e02be
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10632 bytes
SHA-256: 739bdd40bc5b06d2ef7d317ef8abc524b65d03d284a066bb36d96322d642d992

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