Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f818a63c57183c…

MALICIOUS

PDF

73.3 KB Created: 2021-04-30 16:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b545137665b35a90cbace5262893c1cd SHA-1: d303781c3ba69dc150a0874ca7f5892c3f4dcee4 SHA-256: 77f818a63c57183ce1d5af601aa0eabe0e9a970e21f732ea9697bcb10dfa016c
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URIs pointing to various PDF files. The presence of multiple disposable hosting domains and a high density of links suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=d%2526d+3.5+unapproachable+east PDF link annotation
    • https://cdn.sqhk.co/rosisole/c78gOgg/81064536341.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/jiiXig8/telegram_movie_download_pc.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/jujaworobesukazinetexekap.pdfIn PDF document text
    • http://euromarket.pro/game_resident_evil_2_mod_apktqmfa.pdfIn PDF document text
    • https://vubanuta.weebly.com/uploads/1/3/5/3/135348855/pakegakekawadowa.pdfIn PDF document text
    • http://tegor.xyz/texadazaduml19dr.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/86195208383.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/cjbjcje/36645291279.pdfIn PDF document text
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/tamajogimiv_zexexitenigaref_tesaxu_ruwitepi.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/49538447400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_9188de7f700d4def98019865e13f2958.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_7c0a89af16fa4db688a9acc39344fbdd.pdf?index=trueIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/spiral_bevel_gear_design.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_92a8ce778d344cd8a339a15855471b79.pdf?index=trueIn PDF document text
    • http://faleferesevo.onlinewebshop.net/program_spectrum_remote_ur5u-8780l-twc_to_cable_box.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_a91a9099fcc34ba9aaa64d9ed97dadd0.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_b3f86a63c438487eb9b8fe4991c01c79.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_d56ea046de8246db9300b4524c43299b.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 4156 bytes
SHA-256: 3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74
font_01_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 10832 bytes
SHA-256: 84025a9be58aed440c92143e2911c4d1459f9ad5c45c000287cf9665ec88bf06

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