Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6c86d3a076e91a…

MALICIOUS

PDF

71.8 KB Created: 2021-03-12 21:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e4426f4c761637ea24dc526896ecfffc SHA-1: 29b7dd115c6d9b155706ae4edfa54e4b8323c6fe SHA-256: 5a6c86d3a076e91aebaa7671693a06cb491e65f4858686da12f72069d5631ac1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • 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://kuzutuzo.ru/strik?utm_term=how+do+you+enter+the+code+on+a+chamberlain+garage+door+keypad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379482/normal_601a1f724255e.pdfIn PDF document text
    • http://mawuluma.22web.org/rivifodoxeluvedosamudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469135/normal_5fe1909975136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_603c25061e688.pdfIn PDF document text
    • http://prizinsta24.space/crazy_games_zombie_apocalypsewbi79.pdfIn PDF document text
    • http://nowatora.22web.org/fejanirabivemuzokeduru.pdfIn PDF document text
    • http://funseeds.site/the_art_of_communicating_thich_nhat_hanh_free_downloadkuwzf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6037e7db2875d.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://ninokijiribil.epizy.com/12389858073.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_ba90bcbfcb564a59bef1905722c6437c.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_4a9c13f80b174697a4be5075147d0be6.pdf?index=trueIn PDF document text
    • http://gefetela.epizy.com/64233857522.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_0689c82caf3b45cebb539da370b27dfd.pdf?index=trueIn PDF document text
    • http://godebot.rf.gd/6928944100.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_49889638ec0f4332b2f98d0247907bf3.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_13b43dd0cff04073abe2a927c0d0304d.pdf?index=trueIn PDF document text
    • http://famuruvif.epizy.com/cuanto_es_100_gramos_de_aceite_en_mililitros.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_e803ceeea66f4c4297685541a214025d.pdf?index=trueIn PDF document text
    • http://dokused.epizy.com/43975909830.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_921e0bea3420481897268d36bbe11480.pdf?index=trueIn 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_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 5552 bytes
SHA-256: 77106c71260362cd6c8d1529dabc021a3cc3cfa4f64202d954eb492112c7e6e6
font_01_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 10192 bytes
SHA-256: 4d6ad88f5d7404cbb3546abb54d4ac7c588904e2f6b8c3653714ce7b2e441b3e
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2