Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9bd8617585386d…

MALICIOUS

PDF

74.6 KB Created: 2021-06-09 16:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9e754d137bdacaece42a7afd84ea54 SHA-1: cf370deb15ee9738f5e9a27f51e32ed047b92c96 SHA-256: fb9bd8617585386d1e1bdcb016269a53f17f74477357de93e23d85f49a56e822
194 Risk Score

Malware Insights

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

This PDF document is classified as malicious and functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The presence of a 'Download Now' heuristic suggests a deceptive user interface. While no scripts were explicitly extracted, the PDF structure and extensive external links indicate an attempt to distribute or redirect to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://queure.ru/pbw?utm_term=bloody+roar+pc+game
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/512193.pdf
    • https://donumidivapog.weebly.com/uploads/1/3/4/7/134734387/05c187f9709.pdf
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fca82cf6e4e0.pdf
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5feb2702802cc.pdf
    • https://kagafalevusina.weebly.com/uploads/1/3/4/3/134368330/pogowetogedazim_suxaseruje_jisopezi_kunor.pdf
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5feba33bc3a62.pdf
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/mofuzobikazorup-biridufux.pdf
    • https://jomefexud.weebly.com/uploads/1/3/4/7/134732593/laxejodogopavon.pdf
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/pedubed-dodeni-zatiwo.pdf
    • https://fevobubutexub.weebly.com/uploads/1/3/4/4/134481878/5441274.pdf
    • https://cdn-cms.f-static.net/uploads/4480579/normal_5fdc8bc79c87f.pdf
    • https://rijivujebevobog.weebly.com/uploads/1/3/4/4/134488471/vapagagemetow.pdf
    • https://lipisowuke.weebly.com/uploads/1/3/5/3/135387266/47512990bf2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nipekari.pbworks.com/w/file/fetch/144554802/aster_aweke_new_album_2019_chewa.pdf
    • http://sejuworepow.pbworks.com/f/xekiz.pdf
    • http://jorowad.pbworks.com/f/86424380185.pdf
    • http://zepadatoju.pbworks.com/f/diruje.pdf
    • http://mumubib.pbworks.com/w/file/fetch/144413301/82647769637.pdf
    • http://detomipipu.pbworks.com/w/file/fetch/144915456/roman_ank_100_se_200_tak.pdf
    • http://najapenoz.pbworks.com/f/japolukolakan.pdf
    • http://betosaxugawi.pbworks.com/w/file/fetch/144449541/test_formulacion_organica_4_eso_examen.pdf
    • http://tovemubu.pbworks.com/f/rational_and_irrational_worksheet.pdf
    • http://bopezijitex.pbworks.com/w/file/fetch/144849675/calculate_puppy_height.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e610.bin
68a229ac9cbea3c80a2a6deb3411b250a0f7287a46d2e78df5ca9b1d835febc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 5364 bytes
font_01_sfnt_off0000f845.bin
7cf541f5628a6faf1caa82474d141083675e240a95f10e7852bf828bc0bff06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 11040 bytes

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