Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca065af9bbe71cc…

MALICIOUS

PDF

80.3 KB Created: 2021-03-20 13:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aaf4ccf8c69acf8264bb4c14419105e0 SHA-1: 14e82208bb9935c50b8881648c21718b82bb478c SHA-256: fca065af9bbe71ccb84787618ef28455a11f820d8a592f25a7dd4a79554e3e0b
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=assembly+language+step+by+step+jeff+duntemann+pdf PDF link annotation
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/2751544.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/ac689.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/nijufifimolunu_puzonagomolasun.pdfIn PDF document text
    • https://jupedarer.weebly.com/uploads/1/3/2/8/132815187/sufup.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/790378.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/04b530240de332e.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/86433a0c097.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/0ae0a4.pdfIn PDF document text
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/1479880.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/gabizapufabez-mokoketenizi-nonojateza-pevedibuv.pdfIn PDF document text
    • https://womonejod.weebly.com/uploads/1/3/2/6/132681039/397243.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/b6176ccf-cb3c-488d-9be7-72d62e13dddd/guwakaj.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_817f802c32994d4d9b7e754e812c475a.pdf?index=trueIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_1c4c021a1ed348ba9dd237e1fcaa74b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d032c951-6969-4d76-9d27-6ea07176f308/87987578036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c958ee-ebe5-439a-846e-73a8efa3364b/time_warner_cable_remote_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f37dcd-ffdd-4587-aba4-2e6596c9694f/92225347676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cd8d7d-0891-450b-b054-c12552909852/sivubejuvefatisipobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c366f68f-904a-4c3b-b28e-980dca0fb2b8/dokanamamotexules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073dd8b2-33a2-4e10-a213-eeaef0ea069e/colin_rowe_literal_and_phenomenal_transparency.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_b0060c68f1aa4a13ab4d73848ac37e59.pdf?index=trueIn PDF document text
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_78b4a6bf16e247c09e6088cae77a0e5d.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_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 5572 bytes
SHA-256: 29144626a0345ec2b467112a022d096307ab62a10001ace5d132c3b53c884f39
font_01_sfnt_off00010f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1B 10656 bytes
SHA-256: 66a26fb557498efb88a89f7900f0015514bf6f331ea9e416ec174ef7933471e1