Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55b91848a3e0915…

MALICIOUS

PDF

76.5 KB Created: 2021-09-21 08:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca879d5358353119f52c7ec8e9a888bf SHA-1: 67645e7cc198f81aa62afe1eadf81a363584d431 SHA-256: d55b91848a3e0915e02888cb7657d6cc351530469a761de752594f201e820be0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is designed as a link farm, likely to distribute malware or phish credentials. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://studiosiciliani.eu/userfiles/files/fizuzes.pdf In PDF document text
    • https://sgicorp.com/userfiles/files/8076111778.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613495575a851---fuzisixepog.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/95850615044.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/86808313333.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210916125935018793z4ziu.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rexatugalametalu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gelutuwitisunuvibazufo.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/maxopages.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/sirabapiragek.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630804090.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/61812470411.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gusavezem.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210912045247.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/27127324155.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16140130d6f042---donolomefi.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/zalisezupe.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/sonibetajiropapu.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210902_080521.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/56242749617.pdfIn PDF document text
    • http://besteva.com/upload/files/velas.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/4329889297.pdfIn PDF document text
    • http://test-immo.com/file/21526788195.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/49626875852.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/falorovetafabuwa.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/zokaf.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/34250413414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=moviebox+pro+onlinePDF link annotation
    • 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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 10116 bytes
SHA-256: dc25edd54d5fbc079c125bd06a6841d1a149dcdf4034ff175cd9b0ae08399292
font_01_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 17112 bytes
SHA-256: 0ebfa8538c3fae7915e587bc40f3c28c14448adc3b8255f7e074cb2f7ea4ea14
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1