Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8e2e426b899a9a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 01:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5879b515fbf94a66597c68a0075ec36d SHA-1: ee3cbc77df33dd63c6e3290f3ce183b6acfbf60e SHA-256: 5c8e2e426b899a9a42986dba56c387003017e2904cf1b79b2b67cd9eaab6759d
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting suggest the primary goal is to redirect users to potentially malicious websites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 https://cructi.ru/uplcv?utm_term=hero+academia+2+heroes PDF link annotation
    • https://saikekanglun.com/filespath/files/20210910105134.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/jevawozizanu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/logesujozixit.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wotirifix.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/webelib.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/rodipewomu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/48209240345.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nejezuvoz.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/63863787622.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/25301945397.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/31706007931.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74248264619.pdfIn PDF document text
    • http://www.moyekolodin.com/files/febipelepejoli.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907164722923286.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c023ef1965---33388698780.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/7706064991.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/57795228418.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/sogidutuvamaxurexod.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/42052863386.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/43010246762.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/tureresuwon.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/fabefodapapo.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/nevizifepagexenedariwiven.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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 18244 bytes
SHA-256: ab0573b26ae50bfa3e4350ae9834af2a3833af12a79e14ee3ce449fdeb397dcb
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10500 bytes
SHA-256: 16e02b82cdea5ff801d5e8e746ce2cddc7857f051b3b9446bc42c625af83048d

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