Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7e10a18c8f37f5…

MALICIOUS

PDF

75.2 KB Created: 2021-02-15 17:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f99f69c0187796213248a1ed231463ec SHA-1: 1867b0c5194bfe8509bde16db9a174dc488ba9e3 SHA-256: fb7e10a18c8f37f56736deb4b05df3e40a6645524e48bdb7b8788a254b19b446
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://maypoin.ru/wix?keyword=environmental+science+chapter+9+study+guide+answers PDF link annotation
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/6e773e9bc4a1d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_601e74b9e6319.pdfIn PDF document text
    • http://de-bewertung-889562.icu/barrons_ap_psychology_7th_edition_p0qvn7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5ffbec0d740ec.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/3379888.pdfIn PDF document text
    • http://peroruse.iblogger.org/xorot.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/gazebutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fc6c91b85516.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/laginevoporuxab_pabibidurabo.pdfIn PDF document text
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/luwokabusisuv.pdfIn PDF document text
    • http://rufejupewanun.iblogger.org/65380717443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5ff81c8ec3e26.pdfIn PDF document text
    • http://site-shop.xyz/yugioh_over_the_nexusea908.pdfIn PDF document text
    • http://ehaberdevlet.com/50933467846p1kwj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasuzutan.rf.gd/20_gauge_aluminum_sheet_thickness.pdfIn PDF document text
    • http://xufizup.rf.gd/free_hvac_preventive_maintenance_agreement_template.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/gold_platform_shoes_outfit.pdfIn PDF document text
    • http://jamivofobo.rf.gd/cradle_song_sandi_patty_sheet_music.pdfIn PDF document text
    • http://leneter.rf.gd/24340126138.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_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 5856 bytes
SHA-256: 6f19ae78f82bd5e5e8f3052fc7c71a2b924f748d3ad67657eb4c81d53801d576
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10328 bytes
SHA-256: aef6085480c0289d02f0d2bcd34edc078f9c06b23806a6f36e544e18e3e4bbc9

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