Malicious PDF — malware analysis report

Static analysis result for SHA-256 a901c69d1d2b7914…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 21:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a926acbb5667bda3022b10c7666c153 SHA-1: d5453bb48ad0475f38f768a645887a1f69d0d49b SHA-256: a901c69d1d2b791487909936e17f60fbc31d53dd53bb0ee6271790c074359e46
156 Risk Score

Malware Insights

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

The file is a PDF containing a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of a malicious ML classification and ClamAV detection strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may be used to host phishing content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/aws?utm_term=the+collector+hollow+knight
    • http://faromobipon.22web.org/64801205547.pdf
    • http://tawesijaturaro.22web.org/accounting_terms_in_tamil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe841db6-90dd-4c18-b017-5f4b5bdf6fd8/multiplying_decimals_activities_5th_grade.pdf
    • https://s3.amazonaws.com/fulazelof/xelopumibudi.pdf
    • https://s3.amazonaws.com/tajimipojimo/74745064897.pdf
    • https://s3.amazonaws.com/labitajaxatufib/turujatumamininotesuxix.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/audit_balance_sheet_last_date_2018-_19.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_632b068cda4140bd8e8c6eda658af00e.pdf?index=true
    • http://tijojem.rf.gd/ipod_shuffle_1st_gen_orange_blinking_light.pdf
    • http://pinakebe.rf.gd/sympatholytic_drugs.pdf
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_cfbad93252e04dbcb861fdc4512a0ac7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bfb90ccf-29d7-4a4f-8ac7-3990edfb3e30/xukexewasisejaxidi.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_754891417cb14f73ae5f681d7de322fa.pdf?index=true
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_f199fb0917394ba0a0cc8fd7ad903c8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa21df37-2f7e-4fd8-af4a-d579297404bb/panasonic_inverter_microwave_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/ef773194-326c-4ed9-a87b-b6aa980e8172/how_to_set_up_bose_wave_music_system.pdf
    • https://uploads.strikinglycdn.com/files/8991039d-fbdb-4aeb-8c1d-50ceac9e7dbf/54311681963.pdf
    • https://s3.amazonaws.com/mubefula/vafiwanutosesugajiguvixer.pdf
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_7acc242ec64e4672a9bc6fde1c029f89.pdf?index=true
    • https://s3.amazonaws.com/xojafemori/baby_laughing_ringtone_2019.pdf
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_76ac6f6246384db59a54b3e1e7ccaada.pdf?index=true
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_3a9f1063f4334f52b34dfa3253d75069.pdf?index=true
    • https://s3.amazonaws.com/pojikovewijeja/3663701745.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_off0000e4c0.bin
1020dd8376d50dcebafd6108a79da7e4f83fa9ae9be67570000d390719b1412a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 4776 bytes
font_01_sfnt_off0000f50e.bin
bb2d652ee956916c2ef026d1cfb7d7673ff983d869fbc776c977623840bdf1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 9992 bytes

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