Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2923635cc2e1a2…

MALICIOUS

PDF

91.7 KB Created: 2021-04-01 18:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838afebe40600c62835ea688fbd3ae04 SHA-1: 2f5fb77e55fbeadd27d8bd71f52f3c7143b6a55a SHA-256: ec2923635cc2e1a2cb980c69e437e5e8d57ffa4c1ba58545c14dc48673197a2f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-related, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/aws?utm_term=short+deep+meaningful+love+poems+for+him
    • https://cdn-cms.f-static.net/uploads/4371005/normal_6032e025ab027.pdf
    • https://cdn-cms.f-static.net/uploads/4413375/normal_603bf75bc0b40.pdf
    • https://cdn.sqhk.co/surikuzezun/hibejcO/zofosejoworofokej.pdf
    • https://cdn-cms.f-static.net/uploads/4393508/normal_6034bf7eec9e0.pdf
    • http://leririv.sportsontheweb.net/talulexibiwufajizufu.pdf
    • http://vizilirudigub.getenjoyment.net/kaxilu.pdf
    • https://static.s123-cdn-static.com/uploads/4483867/normal_5ff1b8f9180a3.pdf
    • https://cdn-cms.f-static.net/uploads/4446650/normal_5fd9d970c2225.pdf
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/barovokesu.pdf
    • https://cdn-cms.f-static.net/uploads/4481156/normal_601b007f7aff1.pdf
    • https://cdn-cms.f-static.net/uploads/4491688/normal_603bfbede4415.pdf
    • https://cdn-cms.f-static.net/uploads/4370555/normal_605841b29f758.pdf
    • https://foziwumiwogesis.weebly.com/uploads/1/3/5/3/135321673/vubifizileme_linukudo_bowedugujabojot.pdf
    • https://cdn.sqhk.co/buzaxelubot/84gii6V/gunshot_wound_face_icd_10.pdf
    • https://cdn.sqhk.co/soxosovave/hFZifLc/80517798958.pdf
    • https://cdn-cms.f-static.net/uploads/4456712/normal_604329c9d09f7.pdf
    • http://zokoxakabu.medianewsonline.com/mubizikizaliwedul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kebofim.epizy.com/funosil.pdf
    • http://wudemexa.myartsonline.com/29892524200.pdf
    • http://lemibutudigosuv.rf.gd/what_is_advanced_general_dentistry.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012878.bin
f8d96d13fd91aa838d2a7c23666e85deb285d0141ac093f789d753a3281ffeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 5616 bytes
font_01_sfnt_off00013b6e.bin
35601ce2804d9b97d149f73b81b1b2a357d221ec6325429f80a2e1cf207f6150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 10756 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.