Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b82a76294c31048…

MALICIOUS

PDF

76.1 KB Created: 2021-09-13 14:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 76175d7878e1793d3fdf0eeb27dc3fd5 SHA-1: 830f30b7794fc92649c60cd2000f4492a0b1fb60 SHA-256: 6b82a76294c3104843c23610b688c51cb54d7b49904fb180ffa82f2d5554d701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the nature of the PDF and its numerous embedded URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://gyndoktors.de/ckfinder/userfiles/files/1505901531.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/62082596792.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/vesikulepugewoge.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/mokoxolijetomoloxikusiju.pdfIn PDF document text
    • https://huanghecables.com/d/files/pinikupoz.pdfIn PDF document text
    • http://ebus.cn/up_file/file/91851358750.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/jafavowifuzotupafex.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/vivageg.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/82509691259.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109051434311364.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/xewek.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/lopipususawusawixenif.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/83904997806.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/77162016009.pdfIn PDF document text
    • http://master-vin.ru/files/file/nopopizili.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zimizipipab.pdfIn PDF document text
    • https://e-room.co/userfiles/file/50795988030.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gitoguzuw.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/1180859527.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/fizadugusalobusipuxox.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/pidesupen.pdfIn PDF document text
    • https://businesslife.com/content/file/6592214480.pdfIn PDF document text
    • http://thaide.org/userfiles/file/83908175532.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/88875598941.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210906223007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+gms+adsPDF 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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 10296 bytes
SHA-256: 929fbdf1bff01cde54cf3e653461699e64aa0e0f07f95faf8f4edac272bca9c0
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 16804 bytes
SHA-256: 0da66f1e286706fbebff1355ec08ddddbbc5cc51ed69ca1778efe932a7a43b53
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1