Malicious PDF — malware analysis report

Static analysis result for SHA-256 b365531c31ce1495…

MALICIOUS

PDF

75.9 KB Created: 2021-05-21 10:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddfdbcf914a20ea4777773d1719bcdd5 SHA-1: b17655a320684f7a2e525be3e72f1e42f3a39cf5 SHA-256: b365531c31ce1495a35c534da7774bd424815abf0e45395ee4de42fae9b7cc51
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 to PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URI points to a suspicious domain, likely intended to host malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful websites.

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://nipisod.ru/strik?utm_term=how+to+use+cuisinart+coffee+maker+grind+and+brew
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/murerik.pdf
    • https://merezedul.weebly.com/uploads/1/3/0/7/130739463/2237673.pdf
    • https://cdn-cms.f-static.net/uploads/4459337/normal_606618ac2dfa7.pdf
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fce94f7f0a6c.pdf
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/734812.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/tejufufeta-femazedavaj.pdf
    • https://static.s123-cdn-static.com/uploads/4370264/normal_5fc5bb5c20df5.pdf
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/9705060.pdf
    • https://cdn-cms.f-static.net/uploads/4450870/normal_6041bcd86a5cd.pdf
    • https://cdn-cms.f-static.net/uploads/4377704/normal_605826522b78c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sonutopexaramuf/accounting_internship_resume_templates.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/sewetibulikorujopiti.pdf
    • https://s3.amazonaws.com/jejulurowev/what_oil_do_i_use_in_a_4.3_mercruiser.pdf
    • https://s3.amazonaws.com/dewutexorob/8009888464.pdf
    • https://s3.amazonaws.com/wukara/ocean_animal_coloring_sheets.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/quadrilaterals_worksheet_answers.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_off0000ea46.bin
b556c94bff1dba73f5f62b8c696a010502628f974f21aa43c720a28f9107ff9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 5564 bytes
font_01_sfnt_off0000fd30.bin
a60df89951359d481b1143b12f5b0eb4ee3b9106bfc86709b857f8cd7494fd3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 10960 bytes