Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2207f01630f788a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 06:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f0b2edf671d2c3c1de86ce5919591fb SHA-1: d437570cb66624487bd29224e455143462f031c1 SHA-256: f2207f01630f788ada70cd20ecf95dc4d4adf8ed857778d49f9abce5096cb481
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 heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the nature of the link farm and the detection suggest an attempt to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiomanzella.com/userfiles/files/64328568470.pdf In PDF document text
    • https://led7.ru/file/nejilofix.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/56653530764.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/jitelonobaxuluzalexumo.pdfIn PDF document text
    • https://makenie.com/upload/files/70438541013.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/16866299621.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/bibivuxafax.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/nodujovepaduromeru.pdfIn PDF document text
    • https://istanajp.net/contents/files/38913043115.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/58843083891.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kavidixuvisuvoto.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/guxenoluzatasaketol.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/19850495122.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/2906575820.pdfIn PDF document text
    • http://flexa.cz/docs/file/kugafujevejimijesi.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/12857070985.pdfIn PDF document text
    • https://trainova.com/userfiles/file/15520441841.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/tubevedezevaximovafan.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/mijefuneletaxewone.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/20243068121.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/54439141861.pdfIn PDF document text
    • https://alkoplast.rs/files/31112337572.pdfIn PDF document text
    • https://limsurempat.com/contents/files/70042516892.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/64789134162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=touch+light+apk+downloadPDF 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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 18632 bytes
SHA-256: 56b72ed600408c216538bc3d3334714b714b6aa0a3480f91c6db46592a22a974
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 10632 bytes
SHA-256: 2b461b1d37db7fca146b7ffdeeb6947da0140690c3e41ef041dd8769b13af6bc

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