Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aef45893bd0512…

MALICIOUS

PDF

70.6 KB Created: 2020-12-23 15:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ab717b2b24a2e82d8bf965237702e022 SHA-1: 21922bbe5b1a31bdbaba61360198e9aba05b95c4 SHA-256: e5aef45893bd0512dd4b8c12b6c3d3fcd800deb25962d53b114fba68727551a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to 'traffine.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=save+the+earth+song+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fa1ddc0d081e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404983/normal_5fca2f83daf5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fca06c7473b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5f9688f6b2748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_5f9ac765ee13a.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/714f00f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5fafb56e22887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5fc14bc3d786c.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/winumigutam/google_drive_flipped_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/backup_android_application_data_without_root.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/sipezatunipefipenapasuki.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/city_of_saints_and_thieves.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/cuestionario_sevilla_de_calidad_de_vida.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/betterave_sucrire_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/surenejujofebefeponipunab.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 5324 bytes
SHA-256: 80ff74a4b19074aa7434f8ac466dcd192ec929e1ff83fc37b380bd59f2af80e4
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 11036 bytes
SHA-256: 9cc0fd574a0609aa7abf3ff28cc78bbc481a6cc8c855da5a3246d5d9e4959958

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