Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd50c4f33b8e140…

MALICIOUS

PDF

75.8 KB Created: 2021-02-07 05:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aef5c2d4299ea59fadf869d62936de20 SHA-1: d3b10770227f9ce5c7e8cb560ff7466aaf06778e SHA-256: 9bd50c4f33b8e140833c58912807499acf4fbd5d14d19578f36295f7d2373d91
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=hankerchief+wedding+dresses PDF link annotation
    • http://natfreshik.fun/racing_gears_advance_gba_cheatsa9jk2.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/fewiwexep.pdfIn PDF document text
    • http://simkosa.website/ap_chemistry_mole_conversion_worksheet0ln3g.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/e7100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5fe242847e1c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6015633da6321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd7b6ffe3356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5fde185a2c1a1.pdfIn PDF document text
    • http://uose.xyz/87961511849q65dl.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/f9a8bf08e4dd8c.pdfIn PDF document text
    • http://uspex22.online/rspca_dog_walking_guideae1cz.pdfIn PDF document text
    • http://igonlinesupport.com/npr_up_first_podcast_hostsl7guf.pdfIn PDF document text
    • http://nasty666.space/business_and_its_environment_7th_edieeuot.pdfIn PDF document text
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/jagujoli.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/7072385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelodetasa.rf.gd/guzoroxipezaju.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5368 bytes
SHA-256: f9a82e6cefadec03dd73f427894de9cfc3bd1341e72c755c30abc572c5e4f8df
font_01_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 10480 bytes
SHA-256: caf9cd08901efdfbc6647b597d8a2d52f6496ba0b5ab8692b1f2cd4821edd1b9

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