Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26fb4763ad9130b…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 22:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7738d74c97b77b88a0aea590fc54d24b SHA-1: 995f05c979d782351a4b194a363cf23dec34c178 SHA-256: f26fb4763ad9130b13aab2e4056688816d6c27044492a64500fc00edeb35210b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm behavior suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://tyextractor.com/d/files/bonisugafir.pdf
    • https://open-call.fr/uploaded/files/13674971301.pdf
    • https://visualmotion.nl/uploads/file/65028114702.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdf
    • https://ptkas.com/kingkong/userfiles/files/zulilanofebanozogovijale.pdf
    • https://next-engineering.com/userfiles/files/58305042145.pdf
    • http://learnersdigest.org/userfiles/file/21782501246.pdf
    • http://halongwave.com/userfiles/file/mokagoxepobaxowozigoza.pdf
    • http://lynxauto.ru/userfiles/file/72756234004.pdf
    • http://bloodfaces.de/attachment/file/sudofugumuliwamuviwe.pdf
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/lajij.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/25536066115.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/retixidoxepuruvunufe.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/keluneluledusirubododizu.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/19036510717.pdf
    • http://www.jindatunnel.com/up_files/file/63058854036.pdf
    • http://makesomenoise.hu/upload/file/guzudowuwonokefetedaba.pdf
    • https://elnativocoffee.com/silver/upload/files/58541928367.pdf
    • https://thefertilizerproductionline.com/d/files/22365382189.pdf
    • http://k1a.ru/images/files/file/73062104238.pdf
    • https://billard-hauri.ch/userfiles/file/96653846276.pdf
    • http://cesurmakina.com/userfiles/file/64212269982.pdf
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kiteg.pdf
    • http://bhk-aindling.com/userfiles/files/64312673046.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+anime+apk+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 16792 bytes
font_01_sfnt_off0000ddef.bin
8fa5a09db15feb7d53924d00d2e9c6da22210a5593b43912fba14c0ebe8c572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 17264 bytes
font_02_sfnt_off00010a0a.bin
771a7f55abda3f32aac3e187c901aa591c5ec2d750c6914bf597da5c77c477a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10684 bytes

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