Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbb0ccdad2aa50d…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 23:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4cef0542207bd33e122f95ba1efb904 SHA-1: 425eaaa0f67a772f79ca2a77c8f72ae8123af6e5 SHA-256: 7bbb0ccdad2aa50dc7b567103eba60e6f212b7d50e65dc91af442ceacd8c4cf3
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/760268512a38c322915003f0977b7012/tamidivepaxunenar.pdf In PDF document text
    • http://tc-antey.ru/uploads/files/52759749587.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/76863049880.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912143749423720.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/12449467326.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/40692354696.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/92702996032.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/puwubimopizafozorido.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/51799170501.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/ganaduzobikulojimuxaru.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af45a9737d---gudiwejegive.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wozotutisinevasugi.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/47648448071.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/48609288597.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/76479846309.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090913314722345.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/ramixutolizewefogo.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/lexosibedududefupofunul.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/kutariser.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/33671470440.pdfIn PDF document text
    • http://envigest.cz/upload/file/pulujirukupugarotawi.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/19711335029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+5+car+cheats+for+pcPDF 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_off0000aeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 15020 bytes
SHA-256: 5a2d3433c498eb9138ea36489d254164cfad745d47633b320df6b2758468f41b
font_02_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10508 bytes
SHA-256: 802a191c2cbc4ff36febf7d715aaf3132230cca70af09022bc4e11a2a230acff