Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2ac1f721a55bff…

MALICIOUS

PDF

131.8 KB Created: 2021-01-09 11:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 732d4b3da63205efb211fc057d36cc38 SHA-1: 1bfd9195f71a3b1f0fd1da8b466d2d230afb0cda SHA-256: cd2ac1f721a55bff35efdcc577791c53427454d1752502198a52a02c37d20fe0
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm for SEO purposes, suggesting an attempt to drive traffic to potentially malicious sites. The presence of a callback lure heuristic indicates a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffi.ru/123?utm_term=towelroot+v3+apk+xda PDF link annotation
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/8729286.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/fWpjjgi/the_jumping_frog_of_calaveras_county.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jxigJ6k/uc_turbo_browser_fast_download_free_web_browser.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/7e0c6e3fd3084b.pdfIn PDF document text
    • https://cdn.sqhk.co/zimevegi/QCyohha/zombie_ultimate_fighting_champions_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/kIIgf6B/roxexebinasupi.pdfIn PDF document text
    • https://mulujalopopu.weebly.com/uploads/1/3/1/4/131407089/zifexale_mebunividu_pukivisoxugeviv_xosilevafume.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/535f3507c3f24.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/905ff695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a4be8a-2c51-4664-a8c2-5ddbeea62e16/figejetusuxogato.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/abc_australia_live_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/among_us_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/moxagewi.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/1307898699.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/90638958941.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/adverb_of_time_manner_and_place_worksheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9D6 5172 bytes
SHA-256: 0cea994b7956a7be2aff0f57fbd1fa9d2851b41b04384c564f78adabc77d855a
font_01_sfnt_off0001bb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB9A 14416 bytes
SHA-256: 08550fa224679702ad49dcebc88949b44782d22ca5149b30ccd5ceaf8232ea44
font_02_sfnt_off0001ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA4F 16600 bytes
SHA-256: 6bbdcd6bb5c6e24b81a88030800a70acc0a9147d0b1ef644226988a88d433f67

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