Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4d8951a465cda…

MALICIOUS

PDF

75.5 KB Created: 2021-10-10 17:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1e5d265ec6cdefd85dbf914326da5224 SHA-1: ebd0703885165b23a1ab566a9fc4058875d2dff4 SHA-256: 35a4d8951a465cda0d538f60cee582651c4cf150907717ce32c54da83d116a00
174 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect the user to a malicious site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wastran.ru/uplcv?utm_term=answer+the+questions+using+your+own+information PDF link annotation
    • http://dolaninsurancetx.com/customcms/uploads/files/solopedaxajuli.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/646812544.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109160008049676.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/48388351916.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/722753743.pdfIn PDF document text
    • http://yilip.net/userData/board/file/59469718810.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/jokijimere.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pitedilolezixawamu.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/30395914524.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b4c019c1f16abd7a12d979ecc3ca52a2/nepetevi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/11661395191.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/fadumozowa.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/50073810621.pdfIn PDF document text
    • https://12shio3.com/contents/files/kilopebogaweniwexuzemuv.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/luzukizarokor.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gezuxelijaki.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/fokelorapaviparunaz.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/wibopiratupijakux.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/wikizivipapu.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/moxijivukebo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/mujujuki.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/tudobasemojane.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xizelato.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/dorexepejizazu.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/pejakovabozuzuxesa.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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 11040 bytes
SHA-256: c7657306767bb03b00e7010d029c6fa4206a8799ec38856bfab18ec6db8f9bdd
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16452 bytes
SHA-256: 595077a861a45b21822cb37877514d3be925c0fbe79318f5b975624bd2c7a414

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