Malicious PDF — malware analysis report

Static analysis result for SHA-256 864549dd94b51fc4…

MALICIOUS

PDF

77.5 KB Created: 2021-10-06 07:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a16683d6602aab85b6b564906346dedd SHA-1: ffd2d93de1d44d299887a26c09a8c903a2e72b01 SHA-256: 864549dd94b51fc442112c7558c362db748246cef0555872853bdbc2aacfa82a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links by distributing them across multiple disposable domains. Although no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://crewmak.ru/uplcv?utm_term=northern+shaolin+kung+fu+classes+near+me PDF link annotation
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segotos.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vumaxeguponobu.pdfIn PDF document text
    • https://kiptep.ru/file/2464646455.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/nirozopusorodiv.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/74942092535.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210906234625563677x03pzmol3xh9.pdfIn PDF document text
    • http://hankaebertova.cz/userfiles/file/batudixuwogu.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/sagupuxafi.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/92546038065.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/nemotinemowaban.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/fivofodelijokowukejix.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pinokozujef.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_off0000c9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E9 10952 bytes
SHA-256: 7688a59dc3202d1528a19604a3bed3bee28d0bcfbde859ecf6fe79bcc37ac7d4
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 18060 bytes
SHA-256: 2901cce2a4c57acd8fb19fee61a72fd36b86509ca859c77478b94805177ba056

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