Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fe17adefb319ee…

MALICIOUS

PDF

104.6 KB Created: 2021-05-21 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78a524a90137e7e7466d30ea2e7e00ba SHA-1: d319dabc86d47d6aa1b4c117f244f45f81a9eec4 SHA-256: a1fe17adefb319ee2503885f93c8a7ff523db7563af1c8cbfaa7d9910867d534
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains a large number of external links, indicating a link farm. The primary external URI points to a suspicious domain, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=price+is+right+losing+horn+remix
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fe9298134f6a.pdf
    • https://cdn-cms.f-static.net/uploads/4471083/normal_605256c47c60f.pdf
    • https://cdn-cms.f-static.net/uploads/4404980/normal_5fd692e577f4f.pdf
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fe9a8117065a.pdf
    • https://fozujivopaj.weebly.com/uploads/1/3/5/3/135303700/5d7d0c.pdf
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5feb95c6745b0.pdf
    • https://static.s123-cdn-static.com/uploads/4381102/normal_5ffec2ab8474e.pdf
    • https://cdn-cms.f-static.net/uploads/4496001/normal_605d874e2c597.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_604cf4a44974a.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6044fc5c8df43.pdf
    • https://static.s123-cdn-static.com/uploads/4491155/normal_5ffa5e48b8350.pdf
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/jukupuvanivuwan_kuvipoj.pdf
    • https://static.s123-cdn-static.com/uploads/4381988/normal_5ff86c24919af.pdf
    • https://cdn-cms.f-static.net/uploads/4457839/normal_6014d4dbb1d2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a56e636c-92ba-4c18-a313-34350eb68736/vesam.pdf
    • https://uploads.strikinglycdn.com/files/c65263f8-c8ce-484b-899f-dfa204a6d68a/graco_crib_hardware.pdf
    • https://uploads.strikinglycdn.com/files/40cb9668-1b13-4543-8486-31a734945273/eat_well_for_less_book_lidl.pdf
    • https://uploads.strikinglycdn.com/files/47411493-3f6e-4f94-a162-8e0a7e24f47e/how_to_become_manager_at_amazon.pdf
    • https://uploads.strikinglycdn.com/files/b948a889-a308-4567-abd2-22aeaf5f8700/73392817091.pdf
    • https://uploads.strikinglycdn.com/files/84183017-3fb6-469a-a23e-32dfe04c1d80/43057436512.pdf
    • https://uploads.strikinglycdn.com/files/c721a2bc-ecbe-4316-ac1a-3ccb83d48f83/kasapipijuxurug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c20.bin
821cfca2719acdd2cd86f8473e7945af7f1fe97a730e2387d1c9aa3e6c70f0c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C20 4860 bytes
font_01_sfnt_off00015c76.bin
b62662df5776808d679da39f3e3ea1fbf4ee3b3d65493b050f308c403d3035be
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C76 13292 bytes
font_02_sfnt_off000187ac.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x187AC 4324 bytes