Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc478e674938ebd…

MALICIOUS

PDF

99.4 KB Created: 2021-02-28 13:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e6bda94bff36016250678794dc4a55a9 SHA-1: 2cf5df87d464bded14cd6188fca130a286289d6c SHA-256: afc478e674938ebd50e44dea19eb5ffa694c4d2df5b1f9fb28857f027cd0c57c
186 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics as a malicious phishing PDF, including brand impersonation and directing users to a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/ledokesuwirab.pdf.
  • 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://seumenha.ru/strik?utm_term=top+manager+in+pes+2020 PDF link annotation
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/ledokesuwirab.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/9b02dfb0.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/6494156.pdfIn PDF document text
    • http://yourbigdick.space/probabili_formazioni_sportmediaset_3_giornatalgmca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_602ad172b33ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5fe64bab98712.pdfIn PDF document text
    • http://genijiloxaxu.iblogger.org/zupozapevexov.pdfIn PDF document text
    • http://tiwigibafofovit.iblogger.org/86680163018.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/torekusomobeda_merononun_vusotawiredexe.pdfIn PDF document text
    • http://presalle.xyz/356662422h6tgx.pdfIn PDF document text
    • http://com-signto2.xyz/star_trek_ships_of_the_line_model_kits0b1ek.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/bugutaj/nobapexoxikexapebo.pdfIn PDF document text
    • http://nolerepegumadoz.epizy.com/camera_search_by_image_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/37897718334.pdfIn PDF document text
    • http://xumizaxojumiko.epizy.com/56885698909.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/airframes_and_powerplants_study_guides.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_off00014900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14900 5332 bytes
SHA-256: d78c86281b319a447af49be9080cfb0c1a454192980c5c2b195aca4efc55fa4e
font_01_sfnt_off00015b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 11068 bytes
SHA-256: fe632dfbd59f29a5fe8d9daed69fb62c8c2abf23b5dc8ac1a087bc7900acdcdc

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