Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b6356d54ad77a…

MALICIOUS

PDF

91.2 KB Created: 2021-03-16 01:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a814ed66846ecae467e91bdf6a2392a7 SHA-1: 3b52932bd45d6aadb9c2ac5839da8cdbd25f5fa7 SHA-256: 379b6356d54ad77a0d164037205de990cf4c631e711166014294fbd18faeabea
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using numerous links on disposable hosting, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=bookworm+mobile+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487191/normal_5fccda0947e05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fef7b846cb7e.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/delupobol.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/three_solutions_to_tragedy_of_ofthe_commons_examples.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/55082971082.pdfIn PDF document text
    • https://cdn.sqhk.co/kirovuwuvo/YPCmies/mujuwafofibil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_6039449da294b.pdfIn PDF document text
    • https://cdn.sqhk.co/mumeriretepi/mTVHjj4/gitovabavomadefomowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_6048318474154.pdfIn PDF document text
    • http://zowezuluma.22web.org/used_2019_ford_mustang_gt_premium_for_sale.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/3234032361.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/gdih4wP/60891879597.pdfIn PDF document text
    • https://cdn.sqhk.co/diwidivu/dihagfC/nuwajumaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6020b8294066c.pdfIn PDF document text
    • https://cdn.sqhk.co/mokopizel/2heicHF/holt_mcdougal_geometry_answer_key.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
    • https://uploads.strikinglycdn.com/files/25ea0b78-1fa9-4139-97d7-4bd462d9af1e/how_to_use_chefs_choice_15_trizor_xv_edgeselect_electric_knife_sharpener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f834b787-7736-414b-a0ce-a354f4b3439e/jvc_kd-r860bt_wiring_harness_diagram.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/59817100902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85feeb16-d97b-4c73-8d1f-da6b777e2867/how_to_work_out_the_perimeter_of_compound_shapes.pdfIn PDF document text
    • http://dilikibabisud.rf.gd/biology_practical_book_for_class_12_free_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 4736 bytes
SHA-256: 6ed8ecd487253bcf392c7b266cc948f889610a3b09ddb81c0f3a633ed47f5ef2
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 11340 bytes
SHA-256: cfe47eb88ca7d27826f2cdd6c937d54b1af435b9040437ac56e07f5e518e0bba
font_02_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 16200 bytes
SHA-256: 9db8f3a467126188ac8f6f4221473ebed995d1bbdb028712ada6ef77d7b901ce
font_03_sfnt_off000150c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176