Malicious PDF — malware analysis report

Static analysis result for SHA-256 7143c87457879e70…

MALICIOUS

PDF

110.7 KB Created: 2021-04-01 09:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aa1388cbad1098600467e4c0d9c8d9e5 SHA-1: c24cad5bde24f6c36b7c0cbce0fda17e6f898e87 SHA-256: 7143c87457879e70ba717b8e613bf38fb7ca63686a82467827617c01672ae32b
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. The embedded URL `https://bologen.ru/award?keyword=cefepime+package+insert+pdf` suggests a lure related to medication delivery, aiming to redirect users to a potentially harmful site. The PDF structure also contains a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=cefepime+package+insert+pdf PDF link annotation
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/6444556.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/digestive_system_anatomy_book.pdfIn PDF document text
    • http://kernig.pro/counter_strike_1._6_cd_hackg6t1c.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/amino_acids_and_their_structures.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/32333234419.pdfIn PDF document text
    • http://itravelimpressions.com/20282153660z0xjn.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/who_is_playing_in_after_we_collidedlvyyw.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/architectural_acoustics_marshall_long_download.pdfIn PDF document text
    • https://padikolejak.weebly.com/uploads/1/3/4/0/134042397/5837782.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/3073032.pdfIn PDF document text
    • http://kurixuj.sportsontheweb.net/el_alcoholismo_en_los_adolescentes.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
    • http://pulitisagot.atwebpages.com/celebrate_recovery_lesson_6_action.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360695e6-ab74-4681-8d7d-c5d0865f3808/xugaramidorodoreb.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/xeluzolixo.pdfIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/nitrogen_cycle_steps_explained.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/71613074588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c594ee45-95a7-4aa5-9921-d134d22da439/nothing_else_matters_tab_guitar_pro_5_download.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/kumon_reading_workbooks_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e854fc4-e50c-416b-b3ff-26baca0bc177/stuart_hall_representation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee18de4-e35d-4028-ae07-568a72f5f1b5/figatinunununekerepamijiz.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/33486012674.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_off00016595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16595 5208 bytes
SHA-256: dc33a557c4c5ce9f2c9db4f49705d6625ff2d3e426527d6b6a9a3b16e90078c5
font_01_sfnt_off00017736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17736 11044 bytes
SHA-256: e1b5a042f8765ff1b33db7cbfa44c00457bf25af1639e7bf1e031e0982e38a2b
font_02_sfnt_off00019d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D10 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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