Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28041b47a34393…

MALICIOUS

PDF

83.2 KB Created: 2021-04-02 22:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fc2844d4dae2a9ad58931dd0ccab43d8 SHA-1: 992fbe18a0b7f3dffe58e35e73bc33d046a028e3 SHA-256: 0a28041b47a343932d460ba882c0e660ec787ef2aad921e093079056f49b38a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://golowaki.ru/wix?keyword=toguro+brothers+langrisser PDF link annotation
    • https://cdn.sqhk.co/temirikuji/chf5cyb/3d_galaxy_bowling_game.pdfIn PDF document text
    • http://kpupnov.pro/sifulejc6na.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/haihggc/17846416783.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/OhcxiiI/28758544531.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/Gjgfhhv/thyroid_nodule_management_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/gdvaOro/lovukumipik.pdfIn PDF document text
    • http://handler-autoscout24.com/arithmetic_number_system_questions_and_answers4q1l6.pdfIn PDF document text
    • http://vbruti.site/boss_dr-55_for_salek5x1f.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/jPjf0hh/speedway_masters_2_full_apk.pdfIn PDF document text
    • http://submonster.xyz/loxaporadubuj3uxij.pdfIn PDF document text
    • http://cafechorsu.ru/zedozijixlfowz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/brother_birthday_cake_images.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_e9cdc691f90d47fe96987f4b879665ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d3fdc2-639a-4115-9dd4-6eafbc5283fe/36518218778.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_3bb24d17ed1f483aa2b3b1585298d2d0.pdf?index=trueIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_1ad3670e2d514d748dad36e0514b3d33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0590a7a2-b70d-456c-aad1-588322227c10/gebugemutegupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70cf8e54-1e4f-434d-964f-2bbe81608593/sobifujikikopo.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_78e220dfb620416ab9d9d5df5ce7bd44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovilowab/android_6_portable_storage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b94eda-5b99-4312-9e0d-56166391b9fd/chapter_10_completing_the_accounting_cycle_for_a_sole_proprietorship_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdd866c-49d1-4acc-be3d-bf19d8e6b083/wizards_and_warriors_pc_walkthrough.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_408d7047d42d430d8f105b3034664ca8.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 5036 bytes
SHA-256: 6699de19b1f07ad9a9310793628a4fef09ff7bcd006d64a1dbd8c40be2cb8949
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 11008 bytes
SHA-256: 05b699a9c35632a4879ee51fe689faa91f1f37a36feec86c1f2fffad096d291f
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 16196 bytes
SHA-256: 13873d145b8da2256cc9aff7ec32aedf7dd7de0e65fabb376e0f91dd1eea3996