Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b19e5a333195a…

MALICIOUS

PDF

71.9 KB Created: 2021-04-05 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 32c043e78aa267478ae037043a051518 SHA-1: 341be3798418708453456974be2f139a4b0e08c1 SHA-256: fd8b19e5a333195a080f82681f691acfee8cfa496603c402cd26b0cae75b0c9b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the structure is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=atari+asteroids+free PDF link annotation
    • http://faloken.22web.org/deep_freeze_alternative_open_source.pdfIn PDF document text
    • http://latuha.com/random_four_digit_number_generatorhed60.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/ajgfmba/playstation_vr_game_shark_attack.pdfIn PDF document text
    • http://byseles.xyz/past_simple_worksheet_macmillanc6jfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fe73d7ec3e46.pdfIn PDF document text
    • http://jawomubinuj.iblogger.org/just_mercy_bryan_stevenson_free.pdfIn PDF document text
    • http://spoonnumberone.xyz/divegizikumadixubeoa17i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5fe63275e9eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_60249c73d47fb.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/eGUb0dE/kelusiwunodadat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_604a18722643d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497395/normal_5fcd69f808d83.pdfIn PDF document text
    • http://sodaapp.pro/53822457805tqbdj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_6063f42d1574b.pdfIn PDF document text
    • http://wegixaro.iblogger.org/xawaroriwamapukugefef.pdfIn PDF document text
    • http://bevodofad.iblogger.org/vaselejevukafebiw.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/mulerux/sakofutazixefewob.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/87013603433.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/what_does_a_product_compliance_specialist_do.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/champcash_pro_apk.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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 4856 bytes
SHA-256: d3c5d61c6d376b6c7cfb706d106dc84e496d63787ee167f0f0c967ee4fc4f791
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10640 bytes
SHA-256: e9f6683aeeafa382ab2e65def77d0a4c108ecf84a72a6d9d4c264c32320270e8

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