Malicious PDF — malware analysis report

Static analysis result for SHA-256 027ee3f8b269156e…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 08:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf2a06d95d8a055c0f9051fb814b37e8 SHA-1: dbb522cbef530e43dff894995b7a89f5b54dd8de SHA-256: 027ee3f8b269156e61bbe68f8e558da4e3a6518eb6c7036bd8d9d88180856927
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 0.9998

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://leonvi.ru/wix?keyword=17+fronts+worksheet+answers PDF link annotation
    • https://barigager.weebly.com/uploads/1/3/1/3/131398159/nelujanoximi_ketaviranad.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/0be63bd5.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hhdggje/arma_tactics_apk_data_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/VGggfgd/pizim.pdfIn PDF document text
    • https://tajadituzutop.weebly.com/uploads/1/3/1/4/131409135/zupeme.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/dugupudelisu.pdfIn PDF document text
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/3452656.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/haWhbPL/74611290592.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/bedenakuva.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/jhdHJkl/rewemowizegagun.pdfIn PDF document text
    • https://togajakuro.weebly.com/uploads/1/3/1/4/131409127/liwogakinikutivo.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/iAbAb6m/video_player_vlc_media_player.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/novol.pdfIn PDF document text
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/mozidagi_jiwenofididu_naputudokakuw_boburuvimiteji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nawosineromigi/invention_and_innovation_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/kiwezovabulugipujonovexov.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/15577530628.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 4756 bytes
SHA-256: ac861284eccb69175a8ed8f6bde658344c5f3b12320889d0085b03e4f371aea4
font_01_sfnt_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 10436 bytes
SHA-256: ef3784909dec8070e3fd989aa2d7cc06a0ab9f00c8daad93e5b65a750ca5b5d7
font_02_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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