Malicious PDF — malware analysis report

Static analysis result for SHA-256 be665c7701b2ec19…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 13:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c73f72867c2ceeb794da149de36e080b SHA-1: 7cc474d64a9b99a122b4545d2ffee60bec5d1c8f SHA-256: be665c7701b2ec19f9458425e6a68fffa8039c4f4645c9c68c5ebd4428191796
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=edexcel+gcse+maths+enlargement+negative+scale+factor+answers
    • https://vomasixesex.weebly.com/uploads/1/3/2/8/132815370/6334635.pdf
    • http://kaxazul.iblogger.org/95823336534.pdf
    • https://static.s123-cdn-static.com/uploads/4490141/normal_6005a1e9ac435.pdf
    • http://nazorizuz.medianewsonline.com/kenmore_70_series_dryer_not_working.pdf
    • http://sepoxudozixo.sportsontheweb.net/the_splendour_of_the_king_songs_of_fellowship.pdf
    • https://static.s123-cdn-static.com/uploads/4480897/normal_6003f62ec6b3f.pdf
    • http://befujukipepejem.mygamesonline.org/79402183054.pdf
    • http://gejudoxe.mypressonline.com/80693943106.pdf
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fdc3a8fd3f4c.pdf
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/df5ddb001cc82.pdf
    • http://lebojabufi.medianewsonline.com/18590025103.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_60225bab0c6b2.pdf
    • http://kobopez.mygamesonline.org/zusonilusojofuwojipuro.pdf
    • https://cdn-cms.f-static.net/uploads/4474205/normal_604b463059bb8.pdf
    • https://leruvipox.weebly.com/uploads/1/3/5/3/135347136/6055473ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ddfe772-54bb-4a92-a3fa-ad54d808b1a6/endgame_samuel_beckett_script.pdf
    • https://uploads.strikinglycdn.com/files/4e209250-b1ce-4fd6-90c4-fc6cc18f32e0/funeral_sermon_outlines.pdf
    • https://uploads.strikinglycdn.com/files/3571fc41-83f0-451a-b8e4-0ad7c3d2f6cb/viwulefa.pdf
    • http://boxijekew.atwebpages.com/9550704246.pdf
    • http://redejepivu.rf.gd/hollywood_animal_movie_hd.pdf
    • https://uploads.strikinglycdn.com/files/e9c8f126-7b11-4056-ad80-be29c45c5ffe/86022125386.pdf
    • http://nejesezape.myartsonline.com/66080575342.pdf
    • http://gaximomek.rf.gd/sonom.pdf
    • http://pefutofoxuraz.rf.gd/arduino_uno_wifi_shield_not_present.pdf
    • http://zujetisapapido.rf.gd/livagukizegusi.pdf
    • https://uploads.strikinglycdn.com/files/a30b11e0-4d53-4ad6-aadf-74cf3c1fc706/55064451332.pdf
    • http://niwimugosaz.onlinewebshop.net/japolezizet.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_off0000f5ed.bin
7fff6a5fafb8137d57796e83f7a931dfb42b44be8c5a072313fa3fc0dbb26e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 5612 bytes
font_01_sfnt_off000108f2.bin
1a89c98830860bfccf0f398142bbd796b121df61751ecfddf70d25146923e07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 13740 bytes

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