Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d7b8f310ffaa93…

MALICIOUS

PDF

94.1 KB Created: 2021-03-26 08:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a921afd19b310c4f8ad329ac5192369b SHA-1: dd63af8fc1803df26f59dcd479e678adff064e04 SHA-256: 64d7b8f310ffaa93b8853cce67690deea2d900c299b12a068da35f418c36ddd4
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://pelibifir.ru/123?utm_term=plant+structure+and+function+lab+report
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/5869112.pdf
    • http://sabumow.mygamesonline.org/24486658047.pdf
    • https://gabexilo.weebly.com/uploads/1/3/4/1/134109250/4cde7a02c762.pdf
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/6452744.pdf
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/503f7e6792.pdf
    • https://cdn-cms.f-static.net/uploads/4447912/normal_602892f156a4c.pdf
    • http://jiteruruw.sportsontheweb.net/xubal.pdf
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/jibotom.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6025969b55af4.pdf
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/b81c20b68e7d0b0.pdf
    • https://cdn-cms.f-static.net/uploads/4369503/normal_6018382851d21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tiwosutodegadax.onlinewebshop.net/27499230347.pdf
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_4129463908044e818496a68d543e5314.pdf?index=true
    • http://gozuketitara.onlinewebshop.net/bose_qc35_manual.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_140a85525ca0431a8b318c72240d4216.pdf?index=true
    • http://beliraguw.onlinewebshop.net/xibaxuwe.pdf
    • http://fuvarijes.atwebpages.com/913889124.pdf
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_c552e89ad7b442299933e0e741d5f252.pdf?index=true
    • http://liwetagosozel.onlinewebshop.net/beer_belly_or_pregnant_belly_free.pdf
    • http://zukomakiduw.myartsonline.com/ledarexerofelo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123c1.bin
f2109f26c487606f481264bf557f581926b623feae588ef3d3423a67e4faa33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 5172 bytes
font_01_sfnt_off00013550.bin
754b7a327a24ab11864e6fd0c892e6d91c8e9fbd8fc549dcbde4a26cf6ac169e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 11008 bytes
font_02_sfnt_off00015ac9.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC9 4324 bytes

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