Malicious PDF — malware analysis report

Static analysis result for SHA-256 a156d9ead5358e5d…

MALICIOUS

PDF

71.7 KB Created: 2021-06-01 06:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e217bdf111bc18d32db7d8e541e76a6 SHA-1: 0ef6c1af5568a28767d34322336e4aef1f8ea31d SHA-256: a156d9ead5358e5da081891b303ecf638d81a56d81664aaab14086d2e0e100c6
186 Risk Score

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://crewmak.ru/pbw?utm_term=where+can+i+buy+cheap+pomeranian+puppies PDF link annotation
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/4bc4b41d.pdfIn PDF document text
    • https://pulamawuba.weebly.com/uploads/1/3/0/8/130873907/rogenoje-ninom.pdfIn PDF document text
    • https://ragumavul.weebly.com/uploads/1/3/1/4/131483371/tiviwik_kazamaf_fogipif.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/8872896.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/busogubegifozopafu.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/biribisita.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/mosowesukazajo.pdfIn PDF document text
    • https://nabiwadi.weebly.com/uploads/1/3/5/2/135298838/7865403.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/lodusutukuvebo.pdfIn PDF document text
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/posezawukomuv_nipunufobego.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/53a07bae-5fc8-4275-94c4-63bbc2bc92ee/goziretusefuvodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34626c96-8604-474a-8df2-add48d88d52b/ishq_me_marjawan_2_full_title_song_download.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/w/file/fetch/144442563/1119101995.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/how_much_does_a_minky_couture_blanket_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319353aa-286c-4e12-b876-fa1b5323a9ca/wumoxeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d45d91-1fba-41b7-9a3c-92d0d2f22f0f/sample_convenience_store_stock_list.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/kyambogo_university_private_admission_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1700a523-6bd0-4a49-b9fb-1979fbfda3ae/thetford_toilet_parts_28000.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144441738/where_does_lactic_acid_fermentation_occur_in_humans_when_oxygen_is_scarce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3eb4935-17e7-43e2-a16f-2f1b86e39b94/jedefaxijuvexoken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf551eb7-691b-4979-9080-4943f8cd9a6d/nisugadaloverupoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d792dd8b-25d1-469b-9749-37b4c1c49c4d/cognitive_behavior_therapy_basics_and_beyond.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/27827486479.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5396 bytes
SHA-256: 0515d013b4c33dbeb406eb00b191289cbce57f08899c205011b3dd9010329765
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 10828 bytes
SHA-256: f4003e156426d6082a36d2405b056fae46fc22a966a6a566aa2c6dfd230cd3dc