Malicious PDF — malware analysis report

Static analysis result for SHA-256 c610ebf5a21d2396…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 21:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdccfdcc59c93ce7b8388f574be47d52 SHA-1: 847491862585a2b3ee85bb046ebc450017174b1f SHA-256: c610ebf5a21d23960f09b8d3a89a00ec44b74e66c0a43caa47638180a049199b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=emulateur+sega+megadrive+android PDF link annotation
    • https://dortmundpools.com/contents/files/wediravapidusakuroxamiro.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/11650389147.pdfIn PDF document text
    • https://phuquiland.com/upload/files/90792784891.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70066165464.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/54503382215.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/19536623248.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/fedawawenibavagomubibega.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/xikodawavix.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/teteva.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/59900175459.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/58012995361.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/69469721773.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/39858068421.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/pazewanaramudawulapedeb.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff279ee9c---zulur.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/dorowajoxu.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/14200312441.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/xexosaneg.pdfIn PDF document text
    • http://philipsphotographystudio.com/90698994995.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/86637091897.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/wurubajibawamuwebaviwer.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/delisizisexixapi.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/97284536865.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/giwetedaxibunubupabugexe.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 17356 bytes
SHA-256: 2628606807dbb7768c64ce0364fa2a43379aa3a26c163c4759e73c6d403204c9
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 10740 bytes
SHA-256: e2484fd133b4bfd309123df2479a78d9f5c548494c147019f2a568f92aec37b1
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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