Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a0407cffe0f805…

MALICIOUS

PDF

68.0 KB Created: 2021-09-15 19:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 627ea2a5d985d6c6b441b9100b1b23b8 SHA-1: 9b6e092523c180bf0ec6674a3f3589d25fa9f482 SHA-256: 34a0407cffe0f80500062fff8a8dc700ab26f820c95c2e010f548c89debf7380
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to deceive users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure and numerous external links suggest it is part of a link farm designed to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=turboscan+android+free+download PDF link annotation
    • https://tipresentoio.it/images/file/16029188788.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/rerekemonujevolar.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130ece42100b---24530984240.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/gafirobudo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/46409269626.pdfIn PDF document text
    • http://runbo.net/upfiles/files/1631103676359.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/mamibagojiludusip.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lasutonutubiridusesitisaw.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/79414904027.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/84370808042.pdfIn PDF document text
    • http://ebus.cn/up_file/file/sonumaraxenob.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac96bf1bd4---gegalemuvam.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/43945632603.pdfIn PDF document text
    • http://chinahongji.com/d/files/valesuneb.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/babolegamuledutofijufubus.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/ruzugiwiwexus.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/53258762962.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/98602210280.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99747871639.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zotoxavepub.pdfIn PDF document text
    • https://reniuved.it/file/ralurivuvejurilenovunigi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/11190516434.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/zidaximimij.pdfIn PDF document text
    • http://ropesadventure.com/d/files/bamezazegapijonan.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/zawiwob.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_off0000af37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 10660 bytes
SHA-256: 9e95ddae1c8344295f392f51e0e219fa80a6d1f8042cb04d6ea956864d5d0c72
font_02_sfnt_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 14060 bytes
SHA-256: b214ba255987027c39cb1e957c920e10a059fd2689b2bf95d0c6b8eb9e6ed85f