Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c3cb6481904d2c…

MALICIOUS

PDF

75.4 KB Created: 2021-04-04 12:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef01e7499dca859d82c163d21faaa8c5 SHA-1: 7ce079f78ee3d3c648fe8ab6655c8c4628de5590 SHA-256: 13c3cb6481904d2c45d4645a2d2de7d29c4d35f6a2b3adf11d95697eafaae681
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous distinct hosts, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+say+can+you+speak+english+in+norwegian
    • https://cdn.sqhk.co/lemijexo/a6hhjjF/mabomepe.pdf
    • http://jitutirujemi.22web.org/bridgestone_tire_rebate_form_2019.pdf
    • http://tuwasukam.getenjoyment.net/dilifalefiw.pdf
    • http://zitimelad.22web.org/48720390415.pdf
    • https://cdn.sqhk.co/nexetifosam/Eqjc1jb/drawing_board_game_cards_mockup.pdf
    • https://cdn.sqhk.co/reretukida/TW2pY3W/ninja_revenge_will_rise_ganzer_film_deutsch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/desenaz/76324065604.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_03e15990b670483db682390468c8af63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/754ea62d-8a2c-4cc4-bd38-01e4e1138ead/3_out_2_in_motion_offense.pdf
    • http://dogirajuwuxo.epizy.com/75696182331.pdf
    • https://uploads.strikinglycdn.com/files/13b39a20-facc-4aba-8fd9-fdf59ceb5be9/can_a_ppf_curve_be_a_straight_line.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_cfcccff57a014a31b53d2c6a20f59b37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a806e62-5cd0-444f-807e-1386aaf02b2e/ranalexipi.pdf
    • http://rojanesifilagu.myartsonline.com/puwulatitepuvudu.pdf
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_06ba290acd8c45a59a4dd44c748d12aa.pdf?index=true
    • http://kesajebofiruzu.epizy.com/application_of_biotechnology_in_food_industry.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_21ceee775ad6461c9689dedd1f23b97a.pdf?index=true
    • https://s3.amazonaws.com/mosezavor/circuit_of_culture_identity.pdf
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_33aa3e1dc6c442abb3dcf1bef15a205c.pdf?index=true
    • https://s3.amazonaws.com/remeranexe/79417914460.pdf
    • http://fukasutatota.rf.gd/xexixokezexofotome.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e984.bin
8e3512902b05f84fff3f45797b68d4a74693cc6b103c6343a2a19bedbcd7cff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 5412 bytes
font_01_sfnt_off0000fc01.bin
a6ff620136ceaa5863edf55b791df41727dddc9007aa3f7e97e290bfda2576f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10872 bytes

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