Malicious PDF — malware analysis report

Static analysis result for SHA-256 41daf206cfa8b68d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 16:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 396061bc26d36d3a6ad287fc3b5bd08c SHA-1: 5181bd8c1428e8e847b52f5312247bc3555696e0 SHA-256: 41daf206cfa8b68dac945f9d0688c26655f57f9698aac917f99b96dffdc3c9f5
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=ppsspp+goku+game+download PDF link annotation
    • http://zovsh.com/Uploadfiles/files/melinir.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/jibifabuxaxeruvanak.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/dubutenazamevogilutav.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/62648590060.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94b2ca033---taxugoxazejevasoxuvuwuw.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/56713675976.pdfIn PDF document text
    • http://newworldss.com/uploads/file/nuraxefaguwojaxut.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614118af6b3b5---45608178887.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/92989728106.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908005719053.pdfIn PDF document text
    • http://technocom.pl/editor/file/wifomukegobegisuzusumedaw.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/kopabuxu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/58089982551.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/93303247416.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/31063475055.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dituwivorejifenosajepoto.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/74917210889.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/95267343914.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vezedorejajuvamuno.pdfIn PDF document text
    • http://gdgom.com/upload/file/21090905182817868573h0uhvjxuvc.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/sagegiluxafarefiw.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/regomeponujezakejowav.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/23830434441.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/wogokurevidopidugivomaw.pdfIn PDF document text
    • https://dintek.eu/uploads/file/67837168092.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/dofibuvisez.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_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 18280 bytes
SHA-256: 11d0f5b3601eb623459790b46a482bf5c02294a13ac0c61e926d9c170d398c41
font_01_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 10724 bytes
SHA-256: 1a3ad31dd14bfc9e5f459ea4884c5cda429384fe10366717ae6f7ed0e6642b01