Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d1bd8cf3ef2759…

MALICIOUS

PDF

71.6 KB Created: 2021-03-28 20:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba23570a3b90b2f9a06da795c165244c SHA-1: aa23e96952f5567a5e7eb8da1878f53ac1b1db9b SHA-256: b9d1bd8cf3ef2759f728f4bbcc558daec411c24efdb6102c5469c2c8d6729e74
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=akasam+song++naa
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60270a1bd522c.pdf
    • http://golden-charm.ru/coleman_thermoelectric_cooler_model_5232_manualbdb71.pdf
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fe1fed2396e5.pdf
    • https://cdn-cms.f-static.net/uploads/4488092/normal_60412f716c3be.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_605acc99a4749.pdf
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fc7cc8599f65.pdf
    • https://cdn.sqhk.co/fufigavaki/hcjflF5/33933101581.pdf
    • http://mebelrostov.ru/english_talking_dictionarywieug.pdf
    • http://bitsracing.net/riwaporwwnfc.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_602b51feb4593.pdf
    • http://coupons2020.info/namapamabqys1y.pdf
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fdad023c0ddd.pdf
    • https://cdn.sqhk.co/bexamajuw/Mu1jije/blackpink_lisa_parents.pdf
    • http://easterthjg.com/step-by-step_novel_planning_workbookaiz46.pdf
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fde58e433723.pdf
    • http://lozajakar.iblogger.org/types_of_nuts_bolts_and_washers.pdf
    • https://cdn.sqhk.co/ferorigife/hhjgjjS/pocket_warrior_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gebibem.epizy.com/loctite_587_blue_high_performance_sds.pdf
    • https://s3.amazonaws.com/zikeko/adobe_premiere_free_s.pdf
    • https://s3.amazonaws.com/julaxel/32801332460.pdf
    • https://s3.amazonaws.com/gumegulaxi/momajewagupadonifoge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf4.bin
7c14d9d957dac5d5650ae1e9e0e650bfff2af3fca731bc4a308bc38997fa5695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 4928 bytes
font_01_sfnt_off0000ebb1.bin
99e1419136f8d2c325f29c467e62d722fd213e2586902009286b4ce24ced3d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10720 bytes

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