Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7f7bd64082edf8…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 20:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01343fcc0198537b2b9db446dfb093d6 SHA-1: 6063c6c4bdcfbd7750e9f1e8848b0796cf2ce54c SHA-256: ac7f7bd64082edf81e0bb620aad7e2e198e62ebba8d9f202f35ac37c7a356572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable or potentially malicious domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://purofirstli.net/userfiles/file/xuvaralilulemigubusimofi.pdf In PDF document text
    • http://speckrepej.com/upload/file/loxarawog.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/20885717799.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/lobavokudikujeloradanow.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/58876446865.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/72295051740.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1329979795613d6e55f2814.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bc53ec1d5b2267eabbcd271dd5c7ea85/80328371312.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/59756514086.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/41476640702.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109250813035856.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/wirotukul.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/zidoloxazuwexiweje.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c5f22a1efd904c248346458b27f32580/69409586193.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/xunokokogol.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/tepovorifote.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/36815681595.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vizug.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092008014663.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/masuvevukosapadogu.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/13156573546.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/tunej.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/33894607687.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/47850153562.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/90208245327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+colosseum+rom+androidPDF 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_off0000aff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 10628 bytes
SHA-256: 92ececea45b75ee0519b5199ae3cb133c8a1bea936c0545a15399eaec792dcfb
font_01_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16092 bytes
SHA-256: 0927402040d22c425b77852b2f7937f0798f4f5ca04cb9e08801fe5096f87307