Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac837dfd18526901…

MALICIOUS

PDF

76.0 KB Created: 2020-12-21 18:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 91fde129b475dfe1bcee656b512e9edf SHA-1: 93237bed9caf362c05dac9ed0090d632b323d8c2 SHA-256: ac837dfd185269019ec47e984f2db0497d62ba6c31e3f377bc6254a2bbea2c9e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

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://trafffi.ru/aws?utm_term=ajay+devgan+ki+tarzan+film PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385869/normal_5f98a81ac562f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5f8ea2da66267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5fc36fcc9bb75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5fab7cab16830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5f9d15b24a2fd.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/xexebus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xuvamuba/candombl_bem_explicado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd64c0c-ef90-4bc2-86af-51ac1a2d9c46/ky_drivers_manual_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/an_introduction_to_logic_irving_copi.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/no_me_olvides_pelicula.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/jetejotozaratog.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/tuvitoroxusegaxujogebe.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/grim_fandango_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 5068 bytes
SHA-256: 3a6b2be5a3c09e4935673788f9f30bec5a7d4aed0ad95a10e621ccd976d023e8
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 10568 bytes
SHA-256: 9406ef0eaa8d5a497903fc90be58e41521acd4e0e1a77b1f7ab380e88132764a
font_02_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_03_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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