Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f68524d28c0166…

MALICIOUS

PDF

61.2 KB Created: 2020-11-25 03:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 94da887deea37242564f277e292d828d SHA-1: 1716ef0201563d01dec0a5377e8a6396d3d30858 SHA-256: b5f68524d28c016690dc4b5e7d804539cd63aef18ce6c30af6399bdad9af73a5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to S3 buckets, which is characteristic of SEO link farm abuse. One of the primary URLs, 'https://trafffi.ru/aws?utm_term=extra+large+magnetic+sheets', is likely used to direct users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

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://trafffi.ru/aws?utm_term=extra+large+magnetic+sheets PDF link annotation
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/fonedenajuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f9bdf2bc1029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5fa740449030e.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/lodazojamuva/the_fish_bemus_point_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/android_version_9_pkq1_name.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/94372028066.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/xawozaralorudopesisodubub.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/20462069894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a4310d-0e8a-4791-b480-c94cee17c538/nofusevi.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/25979152468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84555ed0-6f2a-4837-8ffc-10e284f0972d/peliculas_completas_en_espaol_de_barbie_las_tres_mosqueteras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571c681b-c39c-416c-85fc-3c56189854cb/mijamaripoguxufowujir.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/romisujunuwopaferas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a067746-5c33-4b1d-a956-ec92dea6b07b/xivodomupunedux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f15c46-2ba2-4d88-957b-4e044d21145a/dezawuj.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_off0000b2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 5236 bytes
SHA-256: 170d12e3f027b58159ef054aa661fcb6981fd54b85be092dbab358ece44da16e
font_01_sfnt_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 10380 bytes
SHA-256: 6540c88f3e40c7a31f3d73d3a8e3030aef087c628ee334f9435cd22f61ec851f

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