Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d8e48991dbe3bd…

MALICIOUS

PDF

91.1 KB Created: 2021-03-23 11:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 01e06a8a070383aad898f9415fc9a799 SHA-1: 149e48051168df485e3830445adf96f6ecfd38ac SHA-256: 70d8e48991dbe3bd96dbf5a0ef6837f5811aa875b94187798c46c2fa3e506b6b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=benjamin+franklin+biography+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6025c452b63bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5fd81b5d5c741.pdfIn PDF document text
    • http://vuvuga.xyz/european_paediatric_advanced_life_supportwitrt.pdfIn PDF document text
    • http://counterman.ru/texas_instrument_ti_83_plus_pongxsgf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5feb790e1afc5.pdfIn PDF document text
    • http://ttop-shop.com/chicago_bulls_font_typesxzd3.pdfIn PDF document text
    • http://greatmasters.biz/best_coffee_grinder_for_french_press_amazonfq09p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377656/normal_5fc6de7b1cc7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_2495beb12c56473db0eca8f634c6d4d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/guide_book_meaning_in_marathi.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_f337315e440d494ab0ea12fb474a291b.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_994adbea5f1446fc871d8cf7e95208f5.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_2e0978579a0c4f97988ce1b5270f56a4.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_709384774c4a48cdafaaeb342a072c0c.pdf?index=trueIn PDF document text
    • http://difugarulid.epizy.com/chausson_640_owners_manual.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_e6fdc5f520e84b0a85b9a24f743b6f80.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_50e15e6e1fe24f9192ae967948ebe49d.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_450f677bf7ca4231bd436fe35fc64c31.pdf?index=trueIn PDF document text
    • http://zowujobosega.rf.gd/bitlocker_to_go_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/39362616500.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_b555f0d9685a475d95c0ea003f6ae305.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 5708 bytes
SHA-256: 831afb76f8b09723d859168dfeda3be915b2506eaaaaa5d28726854be325284e
font_01_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 11184 bytes
SHA-256: 426745cae0704cd7509827b4d4052a4ca7c161226e0f8e5276c1286d98b5ef51