Malicious PDF — malware analysis report

Static analysis result for SHA-256 229dc0ecc8c71de9…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 19:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cf09d4354920af5eb2bde3202b7751e SHA-1: ade0ae7c0b8f7d845b06b8289296bcb97051e30f SHA-256: 229dc0ecc8c71de9e3fe50f4c013ac5f2388ed5d8b06e896d5cf049eeb672c0c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/pbw?utm_term=fast+%2526+furious+hobbs+%2526+shaw+movie
    • https://zirotowaze.weebly.com/uploads/1/3/1/0/131070424/fupikesesulileb_fosuki.pdf
    • https://pilinosaw.weebly.com/uploads/1/3/4/8/134852056/690aee.pdf
    • https://cdn-cms.f-static.net/uploads/4489042/normal_60c22cd8b869f.pdf
    • https://cdn-cms.f-static.net/uploads/4468268/normal_605003ec89bd5.pdf
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/3241812.pdf
    • https://cdn-cms.f-static.net/uploads/4393353/normal_600a22d37063e.pdf
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/8403117.pdf
    • https://dexonakupo.weebly.com/uploads/1/3/4/6/134644734/8ac1c4176b4f379.pdf
    • https://cdn-cms.f-static.net/uploads/4477863/normal_603837cda3e89.pdf
    • https://cdn-cms.f-static.net/uploads/4453551/normal_5fd1a6ccbe8e7.pdf
    • https://static.s123-cdn-static.com/uploads/4373788/normal_6002d8aa21975.pdf
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/23816e2d.pdf
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/647856.pdf
    • https://static.s123-cdn-static-d.com/uploads/4383450/normal_60b695fa5d21d.pdf
    • https://cdn-cms.f-static.net/uploads/4451750/normal_601547dacaf7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8f4dbe60-728b-4683-95b4-e95ada9645e3/23932544923.pdf
    • https://uploads.strikinglycdn.com/files/0b685349-61cd-490b-acd8-81cb032f41dd/walgreens_cool_mist_humidifier_cleaning_instructions.pdf
    • https://uploads.strikinglycdn.com/files/72d49694-6d9e-4154-a1f0-8b7d2d3145a1/76028950451.pdf
    • https://uploads.strikinglycdn.com/files/aacf5949-c20c-422f-8701-3a3d4045a1ca/absalom_absalom_chapter_2_summary.pdf
    • https://uploads.strikinglycdn.com/files/dcb638f7-f81c-4cc4-9c6a-567a9c54c75a/xizipalijumiv.pdf
    • https://uploads.strikinglycdn.com/files/5e3c8e44-4704-4b76-80d3-46ed9aca3a44/96802249772.pdf
    • https://uploads.strikinglycdn.com/files/d8fcaab5-3adc-4ef3-9e0b-019a742f7491/oxford_dictionary_of_english_app_free.pdf
    • https://uploads.strikinglycdn.com/files/240f67cb-33b6-4627-82a3-c5ca3c0f3a39/lotiput.pdf
    • https://uploads.strikinglycdn.com/files/2ff78eaf-7821-4b60-bb65-259c6d6302ed/cheap_prescription_safety_glasses_online.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_off0000e843.bin
68de2972ab4a00d59b4f37b907462d51593eb74a993173877e3f5ebe447b372e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE843 4500 bytes
font_01_sfnt_off0000f79b.bin
550bbd6a0505c4dc1fb40033473ab7ce20b63056e3ebb6d144264cce6b9bbabd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 11784 bytes