Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd0924cd6d68a9…

MALICIOUS

PDF

66.0 KB Created: 2021-01-23 20:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 116bf7b75532683ce9b30d5e753ddb04 SHA-1: 7c0256b857fefb9ef2e24fd16d0fd7baa1c97100 SHA-256: 71fd0924cd6d68a97c9c31c51312c05c30f10468c46fbd2e6c2a8fc5ebeb7892
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure and a large number of embedded links forming a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or redirection campaign, likely aiming to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=ziarat+e+ashura+english In PDF document text
    • https://vorupegesozuzow.weebly.com/uploads/1/3/1/4/131453293/6795662.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/gdribge/first_world_war_ottoman_empire.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/6131495.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/aczifij/clone_space_32bit_support_ios.pdfIn PDF document text
    • https://site-1235873.mozfiles.com/files/1235873/bismillah_in_arabic_text.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/f0tIEgh/tobuxinerobijema.pdfIn PDF document text
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/b72b741.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/wopamajopelega.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/zarizipotobomalesoje.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/99e70a.pdfIn PDF document text
    • https://site-1177365.mozfiles.com/files/1177365/zombie_killers_elephant_s_graveyard_movie.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/f0d4f320a6c0f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zosevid/98780594145.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/amoxicilina_bd_400_bula.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 4904 bytes
SHA-256: da82f10b4426bf3eed1f4d2488c0b482d2d45a7c1fca7e4a7b03894104b7bbed
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10044 bytes
SHA-256: b8962e2ec326474c123f2a4eb84fc1248eaef6ee5382ce770735e9cbc8e64ed9

Open this report in the interactive analyzer, or submit your own file for analysis.