Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4be77c17cda7cd3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 23:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f61b10a688b25cca6b0756e0bd33b34e SHA-1: 0e1ad784e2b5e95429ca4e04434120973d8eb320 SHA-256: a4be77c17cda7cd3c667468917b5d303be24d99aa7c0da3340d74a1160164722
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing lure. The PDF structure and embedded links indicate it's part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=android+11+beta+2 PDF link annotation
    • http://fmi.lu/userfiles/files/72122818389.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83419554273.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/musetofatefebamo.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zuloxoxikerefasozoxuno.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/gapesaxa.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zuvutivef.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/12162975063.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/lenanixezumupogivavimone.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/95653544287.pdfIn PDF document text
    • https://mashura.co/userfiles/files/38934080407.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/geposuxobimilevusopus.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/nazawexigajosuzutogunefe.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/xideletolalulokovewikas.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/bovedigizagotenup.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/76377138408.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/85552112626.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/xosiboze.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/38875521631.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/kusipoxuxada.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dibimilopezelitu.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef454045b0---rifegupimudiwad.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/57024364671.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mupugitajusefaguwuludaxum.pdfIn PDF document text
    • 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_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 15588 bytes
SHA-256: 64a5fb6b4fbb76202532bdce8095505c2aca1857258107c723fe90b0b5189942
font_02_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 10320 bytes
SHA-256: a3eaf13a18f1f9d44eb7b5bb4902ac80eddd36968dc8538e46cc4128fb85290f

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