Malicious PDF — malware analysis report

Static analysis result for SHA-256 bceefd1ad8d907e9…

MALICIOUS

PDF

76.4 KB Created: 2021-05-05 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ae3740a39c5288adfcb458c57d9ad5b SHA-1: bad6d0dd278c0c6ae22a7f7748bd54a042dfc7a3 SHA-256: bceefd1ad8d907e96ad8f92e67e595f4929d2b4b029952bd6331a0c953420edb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable domains. This behavior is characteristic of phishing or SEO manipulation schemes. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware via the linked sites.

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://ponafet.ru/strik?utm_term=half+reaction+of+fe2%252B+to+fe3%252B PDF link annotation
    • http://front-glass.website/sonic_drink_sizes_in_ouncesnv9qi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_6015af8dd6633.pdfIn PDF document text
    • https://mamulexujixi.weebly.com/uploads/1/3/5/3/135390653/woxejizigifasixupuno.pdfIn PDF document text
    • http://salonhq.xyz/zagitet1vqr.pdfIn PDF document text
    • http://verification-help.com/calendar_calculator_2020_weeks6xp61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604e91b72177c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_600ca77c3c6c0.pdfIn PDF document text
    • http://disclosures.space/uk_hip_hop_itunes_chart5qaka.pdfIn PDF document text
    • http://stakingyfi.com/what_is_difference_between_regular_verb_and_irregularibu1j.pdfIn PDF document text
    • http://store50off.info/oster_blender_glass_jar0r9lc.pdfIn PDF document text
    • http://namsinc.info/829056283220gtgn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fe562e76f619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_6023e2f436878.pdfIn PDF document text
    • https://sagopitura.weebly.com/uploads/1/3/1/1/131164573/1ce1455390c273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_603bf175ba4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_60245638c59a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6066666eafe3a.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://s3.amazonaws.com/xulepiwa/870900492.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/vampire_diaries_season_1_episode_14_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/solucionario_castellan_3_edicion.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_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 4740 bytes
SHA-256: f07e8a5444e393668f1f7e80f510a310d65f8163b53783664382a1da9b413394
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10768 bytes
SHA-256: f6cd8b137cbdbc64e3ce03bc880f77b3f22471fc949d38290b40a8dee77540e6
font_02_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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