Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a330e98cedb380d…

MALICIOUS

PDF

76.8 KB Created: 2021-04-04 16:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d1f85246cc1069118dd407fbe8252f SHA-1: ddfea2e99a54e97560983cb07e5b8f4925cb2d2c SHA-256: 8a330e98cedb380dd2972f6112a19262d9d067fc8ab645d228556807ba32530f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm used for distributing malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the true malicious destination. No scripts were extracted from this sample, but the presence of external URIs and the overall detection profile point towards a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=brinkmann+electric+smoker+manual
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5fdd175fadef1.pdf
    • https://cdn.sqhk.co/bafesugoguwi/R2jjhir/69731968414.pdf
    • http://govovimifakine.mywebcommunity.org/25388492289.pdf
    • http://gifagudilul.mypressonline.com/what_is_a_matrix_norm.pdf
    • https://cdn.sqhk.co/foroboreb/gDoVFih/vejuxasabovipotozixifelov.pdf
    • https://cdn-cms.f-static.net/uploads/4484097/normal_604cc8b10c4f4.pdf
    • http://mejuzuw.scienceontheweb.net/90486715334.pdf
    • https://static.s123-cdn-static.com/uploads/4462976/normal_5fce87d7e2753.pdf
    • https://cdn-cms.f-static.net/uploads/4500911/normal_602f134dd937f.pdf
    • https://cdn-cms.f-static.net/uploads/4481522/normal_60465c8c1336e.pdf
    • https://cdn-cms.f-static.net/uploads/4459185/normal_605c92bccf186.pdf
    • https://cdn.sqhk.co/simizekovogi/eaievhi/bugsy_drake_sister.pdf
    • http://sifimomikev.sportsontheweb.net/cell_biology_practice_test.pdf
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fcc48d5bcf1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nogapovo.rf.gd/47169774187.pdf
    • http://pidusuzelaju.epizy.com/autocab_training_manual.pdf
    • http://ferumodos.epizy.com/85136135932.pdf
    • https://s3.amazonaws.com/kudufigunabi/d_d_guildmasters_guide_to_ravnica_dice.pdf
    • https://s3.amazonaws.com/lixasifasi/ecocentrism_and_anthropocentrism.pdf
    • https://s3.amazonaws.com/gofilafixu/6704497822.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe8.bin
211deec07a84d7d3714df9b04a449ed1f7055cc8a0bb26f35d988f36905681a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 4940 bytes
font_01_sfnt_off0000f08f.bin
88a0b9e07759bf1c60be852a3c443571b3e577408ce3e0d727b1d9754c68cac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 11864 bytes
font_02_sfnt_off000117e2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 4324 bytes

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