Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52133639ef2c782…

MALICIOUS

PDF

78.8 KB Created: 2021-06-11 09:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e358802309b62de4af11d9b1aec5cb7a SHA-1: 308f75de69c43358a35e4e1e5404bc256355fef1 SHA-256: b52133639ef2c7820e0f95d24d70222ddb3033e42a85b5321a965b5f1d5fdc60
186 Risk Score

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 phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://drafthe.ru/pbw?utm_term=2+day+a+week+full+body+workout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385417/normal_606e8b8a734f4.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/2b5a4e56e0c0de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_604a7801a2a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_602fdce5078af.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/6675338.pdfIn PDF document text
    • https://zanijiwudiv.weebly.com/uploads/1/3/5/3/135349447/f02f1d9a2.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/9977839.pdfIn PDF document text
    • https://tajujarosoko.weebly.com/uploads/1/3/4/7/134749081/7039696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_60382a77c31f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_605397bb47171.pdfIn PDF document text
    • https://natuvowefuzun.weebly.com/uploads/1/3/4/5/134516005/86f98cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_604acde888db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_604638a46b7e7.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/334d097624bff7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fagimox.pbworks.com/f/rusodim.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/54937258656.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/w/file/fetch/144741264/dominion_east_ohio_gas_jobs.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/pimibomegodivilulasa.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/runafisijebezaj.pdfIn PDF document text
    • http://tagutijak.pbworks.com/f/pigesafudegomowasa.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144627924/manual_accounting_system_vs_automated_system.pdfIn PDF document text
    • http://natofuke.pbworks.com/f/modeling_photosynthesis_whats_happening_in_a_leaf_answer_key.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5156 bytes
SHA-256: b945d316467d384b1fb88ee14f6efe79882175e9e18187e8c323a65583e7206b
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10944 bytes
SHA-256: e2e82990d6743d7fd4dd92bf7069de0dfbfaa8f0f1b5d7ce3880de4bc04db803
font_02_sfnt_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15