Malicious PDF — malware analysis report

Static analysis result for SHA-256 836245f399f9a2eb…

MALICIOUS

PDF

81.6 KB Created: 2021-03-10 05:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b66c7ac0402d2b9b556e2ab84de90601 SHA-1: 890d4fde808fe86bbef40e72005cb5d07672ba09 SHA-256: 836245f399f9a2eb4a434f0f891c01e511770e7a50207be0d19ffa74e7a0ddff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a phishing or content-luring attack pattern, likely initiated via spearphishing attachment.

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 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.
  • 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://resalured.ru/123?utm_term=double+bed+sheet+sizes PDF link annotation
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/tatomabidoxepumevilo.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/sutozevow-nevij-tikekazuluwaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_60133de22aacb.pdfIn PDF document text
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/6371357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454438/normal_600d87d347fec.pdfIn PDF document text
    • http://mananeje.66ghz.com/98694642427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/92659157816.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/dusufalosogimonu.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/gibofarabamifewunove.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/cdisplayex_comic_reader_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/63183226551.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_e9ed413c6b6a4365a7f1ec506923d7c2.pdf?index=trueIn PDF document text
    • http://mavixufomulene.rf.gd/61966307788.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/hazardous_waste_management_training.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_5c32999242f04b1c9e47e09ee7fb7431.pdf?index=trueIn 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_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 4796 bytes
SHA-256: dddf0829d3ed4ca3394fa71c936fddda3db3228648087fda5e52f2929bb3c1ef
font_01_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 10932 bytes
SHA-256: 9539105c74a41e1ad857a91b638d3d519b7edb1a4d0a0ec40fec58de534fa40b

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