Malicious PDF — malware analysis report

Static analysis result for SHA-256 7901e37a2df6a5da…

MALICIOUS

PDF

74.7 KB Created: 2021-01-11 02:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 39957c36f4e3dec6f17d63c0000026f4 SHA-1: 70f00c5e2b34fb11e9fce6fbae7ad665b54f4814 SHA-256: 7901e37a2df6a5da9bfa5f78ccb9bf004b873d9ecc7e52058e4b7f7e66a04f4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites, strongly suggests a phishing or scam attempt. The embedded URLs and the nature of the PDF structure align with techniques used to redirect users to malicious content.

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://trafftec.ru/123?utm_term=waimea+middle+school+big+island PDF link annotation
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/dogixerutam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458614/normal_5fc5be4da9104.pdfIn PDF document text
    • https://site-1173582.mozfiles.com/files/1173582/timagudigusefavugenoput.pdfIn PDF document text
    • https://site-1176115.mozfiles.com/files/1176115/colony_collapse_disorder_definition_science.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fa71b372bc47.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/vemawubatevobewigowene.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/cNAwjes/66929687787.pdfIn PDF document text
    • https://site-1178160.mozfiles.com/files/1178160/4623792871.pdfIn PDF document text
    • https://site-1172255.mozfiles.com/files/1172255/samurai_sword_set_with_stand.pdfIn PDF document text
    • https://tuvomirunasoz.weebly.com/uploads/1/3/4/3/134324776/08dbbd67ab7d2c.pdfIn PDF document text
    • https://site-1214601.mozfiles.com/files/1214601/high_heel_cake_ideas.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/6946458324.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/donarepemi/translate_el_almacen_to_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/sukitez.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/94475660906.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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 5120 bytes
SHA-256: 3bc5e7ee090e84ee54101fccc99f906f7764d50116b1c822d46092d7951e17cc
font_01_sfnt_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 10372 bytes
SHA-256: 04d91ec6187c3ffaa8b507d6656cb1d7edc054a66086b96dffd4b9acb88f2b11
font_02_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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