Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fc93375237c3f6…

MALICIOUS

PDF

90.6 KB Created: 2021-09-18 16:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07ee60388b1b4f70dcfd9bf0d9e658f2 SHA-1: 136b4eb367cbcf5187c6193c2cb497b8237f6e03 SHA-256: 54fc93375237c3f651dad7c1596ea08f50f7b2205e76f0467be8858c66c08995
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 links pointing to various domains, consistent with a link farm used for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tndgdemo2.com/ckfinder/userfiles/files/1004383037.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/metabimitazases.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/71274580393.pdfIn PDF document text
    • http://capableapp.com/uploads/files/bifaxuxulerufazopidak.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/woriworonunakakak.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/minuvuxolexogasi.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/lofejexuwefowepazedujopuf.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17e0bbdcf1b374aa20bdd5ddbdbbec8/sebadutanakasedosimutuxit.pdfIn PDF document text
    • http://888chji.com/userfiles/files/pabojase.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/kexexefuw.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/42205403149.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/17230301620.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/selotewuguvavaxunomuxi.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/28672735424.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908225946291144s3vfwghmrk9y.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/db6r3eoveqi7klqq86cpgm2r02/35501397749.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/25114504461.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/36896308986.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zofawokuwefig.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bexaborisuxuvodebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=reskin+android+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 10376 bytes
SHA-256: 5ac3ecb6e0bdc9ff17c111a677664146092dffb098173df377747561c2900693
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_02_sfnt_off000114e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 18280 bytes
SHA-256: 674a17e60cf40e03a9e67d200ca6e1beacf0f0438bfdea67020177ebde0838ab
font_03_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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