Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33a4087d45a16a6…

MALICIOUS

PDF

88.3 KB Created: 2021-03-19 16:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a9add055366309804298edcb3b3984c4 SHA-1: 1dd15685a23c00200c470e93066080778c2b2b2b SHA-256: b33a4087d45a16a601bdf2005f133ce6b3cd7a2cf11bb39aeba1c7eb8f283c99
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://lozipotod.ru/aws?utm_term=britax+marathon+clicktight+airplane+installation PDF link annotation
    • https://cdn.sqhk.co/nawafoxobok/4Lihygc/dig_deep_water.pdfIn PDF document text
    • https://cdn.sqhk.co/vuramufef/dge9lgc/rawedemi.pdfIn PDF document text
    • http://creditscorefix.info/greek_word_roots_worksheet_answers1jgzl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601bb33c9320a.pdfIn PDF document text
    • https://dulodegusatoto.weebly.com/uploads/1/3/1/6/131636763/f03c223.pdfIn PDF document text
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/17d52b1e20b.pdfIn PDF document text
    • http://gatorama.fun/takufarx96vm.pdfIn PDF document text
    • http://circleshtang.xyz/ruzakulibatotajatayb42.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/xorajusevukimozip.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/gdjgjaz/65730290990.pdfIn PDF document text
    • https://wivutukezed.weebly.com/uploads/1/3/1/4/131438473/eeaa89.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/43eqGjf/lapuvitugab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_602b53c573157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5ff9648abdeb9.pdfIn PDF document text
    • http://gta-msk.ru/8163258051nt7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_603bb732f14be.pdfIn PDF document text
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/kotasupi_fozag_rorisuvokudaneb.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/rQNjjKB/attendance_management_solution_x105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_6041f7151c923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_600573aa1700f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_6044d7c89ab1c.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/zevutebulaworel/apa_references_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/baroque_music_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/50488352408.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_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 5316 bytes
SHA-256: 5ab79a7810dfaa083454cdb9b4f45d8277c92d8c4252c75bbc6d88632f27194f
font_01_sfnt_off00011e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E95 10836 bytes
SHA-256: 2bd4b1cb9330209dab4b0cc32e0e5b3f01f92cd4e4e2840e030f24c8886d8c55
font_02_sfnt_off00014395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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