Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e733e52ab25e73d…

MALICIOUS

PDF

99.2 KB Created: 2021-04-05 08:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 55768783f0707ed2b8095d72b2f21d20 SHA-1: da76f1f6b848300820ecb6ccaed2d596e8c9454c SHA-256: 8e733e52ab25e73d29bd49730b825972d8f3a2c5aca6a38f6995ac1df7a0d60c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=bella+rotating+waffle+maker+macys PDF link annotation
    • http://sisiketunodeb.22web.org/zisetasupun.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/42599249035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387929/normal_6034557b5036d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fe8e906b1afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_6040079869cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_605f3cdeaac5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_604d0d1d8fb46.pdfIn PDF document text
    • http://foramodosug.mygamesonline.org/76677980826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_60633c0f3c745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_604cdb5d43c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fd78c7c6f601.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/julagizidaxif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_5fe187ac36f44.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/63369162389.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/athens_underground_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwafexom.epizy.com/kupifijipebamumumofatu.pdfIn PDF document text
    • http://kefekebew.rf.gd/comment_apposer_une_signature_lectronique_sur_un.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a842a45b-2bb3-45b6-aa13-74e344216c90/how_to_connect_bluetooth_in_kenwood.pdfIn PDF document text
    • http://piruxogijuba.rf.gd/xanejaxidetapuxabupariga.pdfIn PDF document text
    • http://gusosowir.rf.gd/55544680548.pdfIn PDF document text
    • http://diwadakerinepix.myartsonline.com/how_to_merge_docs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d2b659-d1ee-4dd5-9d2a-ea4299fdb2ab/56468351738.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/ketogenic_diet_plan_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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 32924 bytes
SHA-256: 983c903f02a2d6dc57eb82b383935492af580a41c3bd8418a03b709d1903368f
font_01_sfnt_off0001456b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456B 5508 bytes
SHA-256: 90163785f0cc5ba5e652faec2d82ef841872db1319e55032c3b9af110964f885
font_02_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 10828 bytes
SHA-256: 0236e9b9bc5b1cc7c8f6cca13186987694cfa50a1c737102f1d78ec543a563be