Malicious PDF — malware analysis report

Static analysis result for SHA-256 76039c31860453c1…

MALICIOUS

PDF

81.1 KB Created: 2021-02-07 08:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b3ef6b721b2503804c20019cc339b2aa SHA-1: aac4db030640c2e1cbe44278a514994087738520 SHA-256: 76039c31860453c1c22e892dcf1e80ed6d116a284fe64311fe63147aa552a3b4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The embedded URLs, such as 'https://leonvi.ru/123?utm_term=lg441g+user+manual', are likely part of this scheme. ClamAV detection and ML classification confirm the malicious nature of the file, pointing towards a phishing or malicious redirection 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 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://leonvi.ru/123?utm_term=lg441g+user+manual PDF link annotation
    • https://petobaxiteru.weebly.com/uploads/1/3/1/4/131407236/4123926.pdfIn PDF document text
    • https://zoguripan.weebly.com/uploads/1/3/1/0/131070442/a1dc53f1be.pdfIn PDF document text
    • https://tadegelu.weebly.com/uploads/1/3/4/7/134734806/sagexev.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/tujogofanepigu.pdfIn PDF document text
    • https://sudodufutela.weebly.com/uploads/1/3/5/9/135960501/nukoxudafusisujufo.pdfIn PDF document text
    • https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/20d571.pdfIn PDF document text
    • https://malavaxun.weebly.com/uploads/1/3/4/0/134018228/7214135.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/f3c48ac025e.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/9292393.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/9de84.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/2623730.pdfIn PDF document text
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/65f5f52f.pdfIn PDF document text
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/4514678.pdfIn PDF document text
    • https://rudiduwusoxu.weebly.com/uploads/1/3/4/4/134445317/mujewoneval_kerozesaxixem.pdfIn PDF document text
    • https://vovamujif.weebly.com/uploads/1/3/5/3/135318660/sarapupazabepab.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/xuxifuzituwu/hardboard_sheets_6mm.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/accords_guitare_basse_4_cordes.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/85188951948.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/practical_creative_writing_exercises.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_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 5088 bytes
SHA-256: 18f0ef62a817c0c1995e25f3a1bd011c5f108a478c00098813b7e0709f778bf6
font_01_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 10940 bytes
SHA-256: e80db09882bc395e99c81ccdfb508668e819f9aacf1a8eed90448d7f57cb1ebe

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