Malicious PDF — malware analysis report

Static analysis result for SHA-256 03912aeb1e7797e5…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 11:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6edb91607d7de402700fceb1964ae225 SHA-1: 30fec081524b374327af47404bea4adb828229ea SHA-256: 03912aeb1e7797e591f552a14796e54779f1f9fe37b4067cce2c168ccf384dfc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL suggesting a phishing lure related to 'briggs and stratton by serial number'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=search+briggs+and+stratton+by+serial+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fe173430be9c.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/eMxvicc/the_oregon_trail_american_settler_java_320x240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_603e1cb82706c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_604d67c1784d4.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/dhfnLjg/tokugaxoremafiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_60261da13a7cf.pdfIn PDF document text
    • http://pitupunum.iblogger.org/2d_game_character_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_602eb6375809c.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/gigdhiW/my_cloud_storage_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikepodaw.epizy.com/fifovesazed.pdfIn PDF document text
    • http://pivutabomenatam.rf.gd/how_much_does_anesthesia_cost_for_oral_surgery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e46c02-472b-4856-aae3-555d16433f61/zujoxon.pdfIn PDF document text
    • http://vivizegijarugip.epizy.com/ledot.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_3c5093c899194832b0824903f8cb1d1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d96c53-1c9d-429d-8fd1-0f0d7c64cdda/fubaki.pdfIn PDF document text
    • https://bc3ee532-4344-4262-9f0b-d8353e2229a5.filesusr.com/ugd/6ca3f6_1fd10d0775a64a328ba67261ac99a931.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_79c3ffda8e6f430abe2dd68b173a5460.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_6bd547cea32c4bf19ff1458a9589b1e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a689a7-f86c-4196-aa20-421b41398d4b/jufiwibagigijororewerex.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_63ea61dc37a84507802099076fa134b8.pdf?index=trueIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_e6aba7fc3c004115801c1f7c4ee9a336.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e1df04-ee1b-480e-9fa3-a10f3f7924dd/peavey_vypyr_vip_2.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_1cb5d1d54a3044049ce27b4c5b0dc462.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 5696 bytes
SHA-256: bfe75c8b8e4c839d99b4d39e398adfa77ef6fbbf167373b166ba0eec550b2447
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 12144 bytes
SHA-256: 558146469bf4f4c5dcab1f294097e7e6b72fb8c14d899b85bf6c6e996ce3a6e6