Malicious PDF — malware analysis report

Static analysis result for SHA-256 2522a74168f175e8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 04:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aae9ad6636721d4f97955786618daf3b SHA-1: fc0a7814c06114b9ba0e92eb9be247e4abd5c0b1 SHA-256: 2522a74168f175e85ae6fb3e4230436468eeb186f8406e740537d30abf7ea113
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://studiocalderini.it/userfiles/files/todopuwatisimakubupukoj.pdf In PDF document text
    • http://omni-links.com/images/blog/file/bamizokut.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/54488288669.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/koziburu.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/39252193309.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/ligikakelabunidajifanufu.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/fifomizomonomajelominazuz.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/15307875304.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/28758334964.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/xoragomawovipujobodukuvij.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135284757d08---zipefubutitaxujowitaruwo.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/moluwijawiwifif.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906225320.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/7530056448.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/76916933795.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/walijajuxetaf.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/redo6nd0tjlomnj66afcmglc8g/jejikizuguzufe.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/39016804426.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/3741137185.pdfIn PDF document text
    • http://benetalent.com/upload/files/96431379837.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/felogulesuwazenefipus.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/xijabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+hack+ios+no+jailbreak+freePDF 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 19200 bytes
SHA-256: 74555eb7d10618e444e0f13e0f82e81cb723ca16f18449d58b2b164e8ce429ad
font_01_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E2 10980 bytes
SHA-256: 5e9ec4afe607177357a9ff6fa4208a96eca82d7f4dfee529a5552b7c2cf437aa

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