Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae35d6a1b0248ea0…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 05:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a03f87771d5ec8b3ccf6a297c4a35f1f SHA-1: 1d89d93bb9464575f6bec7ced47397a9a205dac9 SHA-256: ae35d6a1b0248ea081e81df372eb161e67cdbcfd405fafe89864a6a7c6cfca54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=world+top+biggest+country PDF link annotation
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/pumibobemuwitekipegada.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/50064968434.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/xobebinadufenubumer.pdfIn PDF document text
    • https://ubranni.com/uploader/files/dilurosutadelufit.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/16906961275.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/99828733283.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/mabefukibeliranesavorosi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/98767692230.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gopovovola.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210921134914.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/fonal.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/kidepabefewakizuvupe.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/86626552050.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/83286350586.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/tojirujuzexofijatijiz.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/85775385034.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_EF8E5929CB5A2471.pdfIn PDF document text
    • http://abc-tel.ru/data/File/86584210456.pdfIn PDF document text
    • http://freeski.hu/freeski/file/gilusuxedukewexot.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/16356773756.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/20711282170.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/58381649111.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/litimavupizifu.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/tuxanigubejajuxixa.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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 16660 bytes
SHA-256: f123cf6fde7cb56168d2f933ab0add9c308af7a586ecf04831fd2d586ea695e7
font_01_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 10876 bytes
SHA-256: 19857a0a832c48947b3b7dd72fcb052398e4d3c0be852412af82545cbb866149
font_02_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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