Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c67bfa413c2046…

MALICIOUS

PDF

77.5 KB Created: 2021-03-09 18:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbb15a2ea6080708ceb4e21a86b31217 SHA-1: 73a12e014484ac9908f55ed2bc7e590b16005d4f SHA-256: 36c67bfa413c2046225e940f4bf9203f2d3441a3954d0dba783cbb9644e22304
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with many pointing to disposable domains and one specifically to 'midufefew.ru'. This behavior is indicative of a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/strik?utm_term=d%2526d+5e+racial+bonus+chart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491155/normal_60065e66d2934.pdfIn PDF document text
    • http://my-favshopd.online/dr_bhimrao_ambedkar_movieneqb0.pdfIn PDF document text
    • http://heleogose.online/19547375209l1aoq.pdfIn PDF document text
    • http://xitnet.fun/dogagobinabasomuvowupufit2220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fdc0536b3aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_601a789f646e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_60288fa8560e1.pdfIn PDF document text
    • http://dreamingdeveloper.com/92573667982db33z.pdfIn PDF document text
    • http://cenderaoriginator.com/wabajiboxoxunijaniselnkx6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ffea529b14a4.pdfIn PDF document text
    • http://docita.fun/49987943443ttd2z.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
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_7b539d69d32440b6abdebe7b266c7d7c.pdf?index=trueIn PDF document text
    • http://tuxojemuje.rf.gd/holmes_humidifier_filter_cleaning_instructions.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_253984e385ab401393441c41a354754b.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_0b102e400da9410c91f0d0285091fa82.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_d3a088a09f714b7da21f27e69a7ffcf1.pdf?index=trueIn PDF document text
    • http://kupavojos.epizy.com/aoe_rise_of_rome_full_version.pdfIn PDF document text
    • http://lodibusalibazi.epizy.com/dagalun.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_fc7f8891a08d450bae387e260422228e.pdf?index=trueIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_8d1a789b951c4589aff1067e14e5a58d.pdf?index=trueIn PDF document text
    • http://muzizax.rf.gd/silk_face_whitening_mask_sheet_skinfood.pdfIn PDF document text
    • http://jitapalerex.rf.gd/amadeus_rivista_cd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 3484 bytes
SHA-256: 48524656b3e374db2655985bb23235a78a7fb2c8eb08756719506f3bf9aeaf8e
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10588 bytes
SHA-256: f4de326c6012fbfc8f6131f9cf7376f6455b2a7f0d832febdbab5c1e3fe49701
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c