Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68000b409bd0ad3…

MALICIOUS

PDF

75.5 KB Created: 2020-12-03 18:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e0752b63975e93bce41b38fa84c5f609 SHA-1: bfd861d5715e7a24e04d5eb7cf0593b8619a962f SHA-256: a68000b409bd0ad38adf9ca413455117f18781c3d81a51bb99cf55606d0fce52
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/aws?utm_term=monster+hunter+insect+glaive+guide+reddit PDF link annotation
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/bab3876f4.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/7052517.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/c1819b0c0c.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/856b58e53af63.pdfIn PDF document text
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/dofipamelorebe-lakufo-rutazavugavu-dunuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fa800a6b019f.pdfIn PDF document text
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/mejosos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fc3c756be565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gosete/fiori_3_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b5434c-7d23-491c-b5ef-560b057af6ab/bepiminifulojopisug.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/5667575493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331a592b-5c33-4f8a-995c-3d1283a68988/siwojemanovipugemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012636a2-43bd-4c41-a362-235a4e715dad/team_randomizer_generator_pokemon_showdown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82b54ed-e987-4579-ae52-1efeb1c978e4/zmodeler_3_license_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/fur_elise_violin_sheet_music_solo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3d31f4-488c-4966-a73e-e24634621c46/dave_matthews_banda_41_brixton_acade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 5264 bytes
SHA-256: ee45f0c2591d31c18759a92d0aaa85dc2a8fe8ecba1c584d12ac7b5b700646f6
font_01_sfnt_off0000fc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC98 10564 bytes
SHA-256: 1640f57700dda4a1c5e845f4e9ba15f2bfdc65ca3a19b6ba3764faf70978b9df