Malicious PDF — malware analysis report

Static analysis result for SHA-256 956757294e7b2acd…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 12:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b4bb53cfa0c80d807e992ce0dda2e9b5 SHA-1: 9c1d6a9607a4ff82ae3e9145415884ca15cdce6c SHA-256: 956757294e7b2acd1ef0adcaebfdd8f3e34acfcbeae09760b40ac4a86eb1cdea
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions. It contains numerous external URLs, suggesting it's part of a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=sat+practice+test+15+answers PDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402a187de38---titosibutinekax.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/vofupib.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/nuzajofumoxup.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1bbd70f7f5412e3bad636f1d5bdc0ff6/zisasu.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210909060258.pdfIn PDF document text
    • http://beiks.info/public/file/53344040953.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/romaxevuf.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/35637374037.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/38530865361.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/loratiragebom.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/mikokexajimivavafoba.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/1991874344.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/mufeja.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/79452597165.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/wubowudozojojivo.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/50924302583.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/getonoxegivimebusesisida.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210926045602_8mk1aw.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/nevomaxaxip.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/79237022353.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/barasavuzobirabasojijinob.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/28843535700.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/43846327378.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/89620076356.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/56341931687.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/38475662189.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/12453118216.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_off0000b166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB166 10548 bytes
SHA-256: 85c85c03061b1a27624c767fd81e950acc9bde8ba595ed37e1af041e93c8344a
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 14308 bytes
SHA-256: 5b69f1b04001b39cb308e7c6bbb241a400b495b55d863a9cdb97f84e2b02be0c