Malicious PDF — malware analysis report

Static analysis result for SHA-256 af46bf49c564a545…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 11:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b982399eb9db9280f13a9115ce6572e SHA-1: 2965b9c0f0092e0f7843d00b2028a4fc466a00d1 SHA-256: af46bf49c564a5454b70b6eaa0206d4d9161dc5b9f2aefb11113eb1568537eed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=the+shockingly+high+cost+of+cheap+fashion PDF link annotation
    • https://smartech.lv/sites/smartech/uploads/documents/files/90860110299.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/12493375837.pdfIn PDF document text
    • https://produse-zilan.ro/files/walukozafuxug.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77513293083.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/42322935406.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/wavigax.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/8682456922.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/47494166205.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/nulusopokubixowifofetibik.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/38424153817.pdfIn PDF document text
    • http://apvn.info/userfiles/file/72753923060.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/nonugakiramelexewoxatiki.pdfIn PDF document text
    • http://nemalipics.com/sisesoxezenajigigizu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/60487411878.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/sanimanivow.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lapatabumulil.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/depoweri.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/91667073488.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gamolinafa.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/zuzapevusolijatade.pdfIn PDF document text
    • http://stroi-sistema.ru/img/gebepuworagevidovan.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/jumidewudumiderasifasipig.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/nikov.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA2 16104 bytes
SHA-256: 05c7e1aed7c03602b060228779f78b06eebf2622eb166a3f46f27112056a07a8
font_01_sfnt_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 10828 bytes
SHA-256: 87ca34656ebc9eb81ebaf9c3ce0b712b4c3c6a9eaded0486b5820b9a61a974d6
font_02_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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