Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b738e375fac147…

MALICIOUS

PDF

99.5 KB Created: 2021-05-12 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bfca94b0d9882e885b5842b9f96599 SHA-1: 247ff740238be9ecdbca6082f039002bc8d331bd SHA-256: 42b738e375fac1470e720804a0ec7fd85594e76c575576852c10c66ea65fd7f6
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to external sites, with one URL specifically mentioning 'investment analyst interview' in its parameters, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on disposable hosting points to a link farm used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mezovuduw.ru/strik?utm_term=how+to+prepare+for+an+investment+analyst+interview
    • https://cdn.sqhk.co/bujasugawo/mo7ihhi/fantastic_fishing_mod_apk_android_1.pdf
    • https://static.s123-cdn-static.com/uploads/4469375/normal_5feb5bbfc41c8.pdf
    • https://cdn-cms.f-static.net/uploads/4408712/normal_602c825c9b43b.pdf
    • http://betizekaxu.getenjoyment.net/jalujizobulo.pdf
    • https://godewofevi.weebly.com/uploads/1/3/2/8/132814364/wimoremulegu-reletu.pdf
    • https://cdn.sqhk.co/xolilipedeko/gcii9if/alien_invasion_monster_truck_shirt.pdf
    • https://cdn-cms.f-static.net/uploads/4426688/normal_60406060819be.pdf
    • https://cdn-cms.f-static.net/uploads/4485810/normal_603d038119532.pdf
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/zotanezuzid-pusefagejolare-subekediremuses.pdf
    • http://dejepuzalew.mygamesonline.org/acronyms_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_603301b393fb5.pdf
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/zuvopabuzurovobox.pdf
    • https://faboduvo.weebly.com/uploads/1/3/5/3/135343103/2581963.pdf
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/migivebezegixojoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4b7552b6-83db-44e8-ada2-b15e73560966/wurifofezefu.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_a7ab7bc68da14ebb81ee72b83dbfba6f.pdf?index=true
    • http://seretavezoduriz.onlinewebshop.net/25967067735.pdf
    • https://uploads.strikinglycdn.com/files/02308cdc-7a10-42a8-a639-a29068731aed/arkansas_cdl_drivers_manual.pdf
    • https://uploads.strikinglycdn.com/files/c8beb19c-5176-4125-aeda-018364f87965/skyworth_smart_tv_55_price.pdf
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_f4ca93b21c05400eaca6632dfbbc907f.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_d9724b192f764d7fad5ce5e54f0a70fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc434a2a-c83c-4ba7-ba0b-3a4e8cbe376c/larosotinulugupimuji.pdf
    • http://bitines.myartsonline.com/burger_king_coupons_juli_2020.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011997.bin
82dac4e3356c775ce7071061352a33eb8bb1a168d6131fa139c890368cc6ce32
pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 5052 bytes
font_01_sfnt_off00012ab5.bin
ed7a9e95a1afd16e88afeb939e565f028e53243eedf10fce7ffaab5c8c2dbddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 2272 bytes
font_02_sfnt_off0001350b.bin
87e9c973de95a9eae9b411f65ab4d0d8f6ea8a97e203e389e58e6d5533ab06f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 11500 bytes
font_03_sfnt_off00015c7d.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7D 16036 bytes
font_04_sfnt_off000170e7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x170E7 4324 bytes