Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd83de6c8cb2bae8…

MALICIOUS

PDF

72.1 KB Created: 2021-03-10 10:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bff7b40ad1441ef6b96ffb8b906442c7 SHA-1: 13bc600089a6618f26f4b37638c96467fc8ba587 SHA-256: dd83de6c8cb2bae80eb82c812e07650bd1a37d8997ee14883221df06d2415304
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs are likely used to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=unqualified+report+meaning
    • https://cdn-cms.f-static.net/uploads/4418968/normal_6028ab12adfe4.pdf
    • https://wikomatoniv.weebly.com/uploads/1/3/4/5/134501486/munopef_maketatub_jegit.pdf
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/gonob.pdf
    • https://static.s123-cdn-static.com/uploads/4479705/normal_6005f29074df8.pdf
    • http://pubgmobiie.com/horton_hears_a_who_full_movie_in_hindi_watch_onliner40yl.pdf
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/lezatotawuva-kijuvifobojerax.pdf
    • https://cdn.sqhk.co/bibunifez/02ggRIR/rivals_at_war_firefight_mod_apk_offline.pdf
    • https://sosojenanoxo.weebly.com/uploads/1/3/5/3/135316520/8621886.pdf
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/2914415.pdf
    • http://fineagencyy.com/husqvarna_rz4623_deck0xdor.pdf
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/nasetarakapu_toxowixaguvani_lafamesoso.pdf
    • https://kudezugomolalu.weebly.com/uploads/1/3/5/3/135331411/03c11d89a3bf.pdf
    • http://nesobaka7.xyz/47102280651y1prv.pdf
    • http://coolvdomaion.online/nikipomajbwhes.pdf
    • https://cdn.sqhk.co/zivuzigup/gcRWaig/mijutojit.pdf
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/mewosijuxuwisomefawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd58.bin
e21f665a9426bf3e2329e15d6ce7d6ca7f0491e9709c1ae42a69047e70828eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 5300 bytes
font_01_sfnt_off0000ef46.bin
6124aae9defc6e7545d3e65631270509db6169300a952c3a09b109db23b5a144
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 10588 bytes