Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58df3c3beb944ad…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 22:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51fd81bdd8d9e54dfa667fe761146275 SHA-1: f62852cb636d16b0e6f86a860b5dc06034e71fc7 SHA-256: b58df3c3beb944ada7e42e8a536050ec6e32c9d1f5270f54bfde7e957edd3a87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with many of these URLs leading to other PDF files hosted on potentially disposable domains. This suggests a campaign to distribute malicious content or phish users by directing them through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synphabase.ch/upload/file/wolegizik.pdf
    • http://beccaro.it/userfiles/files/89298347860.pdf
    • http://cybernet-ap.com/UserFiles/File/lokokus.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/milutolubasobenomi.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/o8umb571q1k08dq2jc4284auoj/31947741297.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4a98e17ea46c0518c36f35a28ad8792b/xoviduvuxifitevemene.pdf
    • http://xn--h49al71atridzo.com/userData/board/file/xesezutep.pdf
    • https://resicolor.com/upload/files/54866449962.pdf
    • http://xn--9w3b270a7kf.kr/data/editor/file/90837588153.pdf
    • http://mariondhuique-mayer.com/data/file/zijuzodolulup.pdf
    • http://gnatowski.pl/attachments/file/tisufixaloxemiwaxoguri.pdf
    • https://advantage.ee/media/contents/file/52017022602.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83248904304.pdf
    • http://desiaussies.com/ckeditor/uploads/files/18064330149.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/69522176318.pdf
    • http://lavalnerina.com/userfiles/file/malusipapovavumamewaxip.pdf
    • http://china-baby-clothes.com/d/files/14312143245.pdf
    • https://mimpiindahsatu.com/contents/files/67484581449.pdf
    • http://zenkatsu.dk/files/bigedenomi.pdf
    • https://vanvoorst.info/uploaded/file/77607695942.pdf
    • http://www.donboscovizag.org/images/files/sedavajamojuwa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mobdro+live+tv+streaming+app+for+android
    • 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_off0000c527.bin
3ab8316f603f42053893f5bcd57481b8de1b89eeea73ba68b99ae267f52461af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 17456 bytes
font_01_sfnt_off0000f236.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 16792 bytes
font_02_sfnt_off00010a4d.bin
a7c1e2b5d68b76ffc23b97e795ddbd9613b1589cbcdc233d0a35587b8811bd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 11040 bytes

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