Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa67f2098b27b7c3…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 14:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3b1bb22132333422b8c7c1363962eaa SHA-1: 56eb819dbe9519899163df4966d863fca98c8ec7 SHA-256: fa67f2098b27b7c3bd17c5322da7970862c87b28811636727f50cdddc9a9922b
156 Risk Score

Malware Insights

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

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 0.9996

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 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.
  • 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://dafemum.ru/strik?utm_term=the+killing+of+uncle+sam+audiobook PDF link annotation
    • http://vukesis.iblogger.org/99257276765.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/1619795.pdfIn PDF document text
    • https://siromalad.weebly.com/uploads/1/3/5/3/135312661/gidapopoluzir.pdfIn PDF document text
    • https://vikenefimedok.weebly.com/uploads/1/3/4/3/134390201/situnavozukoj.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/bufinemuf.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/lee_pro_1000_progressive_reloading_press_reviews.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/834ae2.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/9525209.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_2e7f156fb1644ae28758369be9e874e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/serunewememema.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/oxford_guide_for_low_intensity_psychological_interventions.pdfIn PDF document text
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_6ec93613708f4c12a6afe8b8b4620052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/interior_designing_schools_in_uganda.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/ritifapemadopotipebevipuv.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/39480934430.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_f12bd0292034461a9edca775831ee4a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kotidox/schneider_electric_isolator_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/characteristics_of_sound_in_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/public_speaking_fran_lebowitz_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/will_it_snow_this_winter_in_oregon.pdfIn PDF document text
    • http://genenapukiral.epizy.com/beech_a36_parts_manual.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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 5492 bytes
SHA-256: fed07911f12c30283a8e1363e2cb6aaaeea7c4c52bd14c95f26208d527267cc2
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 12224 bytes
SHA-256: f277cd2092f4c2c8bfd2d5c2d23c4fbbc59e51baa6a609be26e3a17484f2fd7d

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