Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a0760424875721…

MALICIOUS

PDF

94.1 KB Created: 2021-01-28 05:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 98f4b2b456807a4f97a24b2696815078 SHA-1: 1608bcc3253929aa0b44f528f60bcaf20dc8c883 SHA-256: a7a0760424875721564f5a89d6432ccdff5b1574fc74e7b47ad067bddbd18358
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to other PDF documents, a technique often used for SEO spam or to redirect users to malicious sites. The presence of a link to known malicious redirector infrastructure further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=wererat+d%2526d+3.5 In PDF document text
    • https://cdn.sqhk.co/benibavagoge/i8ygjjc/81160465165.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/tegoruxusa.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/bhchcaD/3d_tuning_car_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/j6je1el/42595826062.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/XBE3rJD/mega_bloks_first_builders_fast_tracks_racing_rig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fe1128d098b1.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/dZhb2ja/xunikurujuxepewonowuwif.pdfIn PDF document text
    • https://faponeganaves.weebly.com/uploads/1/3/4/0/134041241/3221131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ff3bf265e2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fe9c540d2d8e.pdfIn PDF document text
    • https://cdn.sqhk.co/fupipevu/boKA3hd/dapod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fd06478e4426.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/Fnzhfjh/stickman_jump_shadow_revenge_super_saiyan_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jojeibd/42365869229.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/hj7jids/wilhelm_scream_in_disney_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/mhUNcgj/32779856992.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/gugakajirizexudone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 4148 bytes
SHA-256: b3269828233ea411f06db212cffadfa5d4f4ecbc6d34c661f78f4dd335c4dc03
font_01_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 10904 bytes
SHA-256: 39a1cffbda8bbddd3765ee8b15d71f13071402f7ff41e036877f9dae416e39b2
font_02_sfnt_off00015d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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