Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55d9d872d71460a…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 19:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9224702d2b22766e8b6022143c611e05 SHA-1: 8a1105b180a92aa1419e6f942f08c00e72aced35 SHA-256: b55d9d872d71460a91e709f0f10fb1959fcaa5d68e0af046cd712e2d5e3159fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=harga+hp+android+yang+dibawah+1+juta PDF link annotation
    • http://sportingfoundation.com/uploads/file/modalowekinuxiromiv.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/60723264487.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/13401961671.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/mixuruz.pdfIn PDF document text
    • https://aayams.com/userfiles/file/gorenomukuxotus.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/11718576242.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/sagikerigaroruvi.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/77549224113.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/82551802315.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/doxezawupufekum.pdfIn PDF document text
    • https://codecs.ro/images/file/kupuk.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/29027990819.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/97665143563.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/xojaxojiguses.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/61514404109.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/92463737752.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/vaxewufug.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/41485615147.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140576b94757---1321410638.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/damofumakuxe.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/30598748218.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_off0000ab5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5C 10936 bytes
SHA-256: 2c524ef1ff7bf0024d8d68e929f7321e03db4c3481a1fe21651f7a2a137bbfd4
font_01_sfnt_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 17036 bytes
SHA-256: a88fd884de21453404cba13e72f49a5cf2a5097f425a39a63bdf283010d6b47e

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