Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465fecc4a56cb95…

MALICIOUS

PDF

65.4 KB Created: 2021-02-27 02:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5a99a8dede40955f90121a15f1dd59d6 SHA-1: 3bbfea83fde3dc5b056e89b9890d2a7ac342dd2e SHA-256: a465fecc4a56cb9593bcdc79616ba2c01e7c57f7bfa933273cc39eb8e47166d7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/award?keyword=what+is+puerto+rican+food+called PDF link annotation
    • https://cdn.sqhk.co/gituridewo/gdS9eid/to_do_list_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/1gctch0/19884996907.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/building_maintenance_plan_template.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/nikisiraposulaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/fjdidRM/75519594721.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/f1b251d1.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/ajcghgF/rare_boy_names_that_start_with_a_d.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/retunakimurupoki.pdfIn PDF document text
    • https://cdn.sqhk.co/ruselaguzoda/idq0iiP/airtel_recharge_list_keypad_mobile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fcbd8cd3be88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_60376a618b50c.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/hjjiehb/96528150180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_6039836abcbea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/47410312739.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/25773246956.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/masked_singer_monster_performance_episode_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/8733767474.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/zigijuxowugorevosuso.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5256 bytes
SHA-256: b943e154b87c152f4b4bd7c1637268c02abe3fcb973e6d781a38744a64251a84

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