Malicious PDF — malware analysis report

Static analysis result for SHA-256 318954cfa091f9d1…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 09:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7a9b81c847c3845f5fc3affd9ea9b94a SHA-1: 27b8cbe4ab0f31c13262016b42f31f265bf56ad9 SHA-256: 318954cfa091f9d1e8a36fc64d47e717bd69abb96923ba72615ed7d351ac9b6e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though heavily obfuscated, contains keywords related to downloads, and the embedded URLs point to various PDF files, suggesting a lure for users to download potentially malicious content or visit phishing sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=butterfly+valve+pdf+download PDF link annotation
    • http://hamsterbig.com/2387825991gyor8.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/cjbQrXP/94180193281.pdfIn PDF document text
    • https://cdn.sqhk.co/sukexesi/7xc3ggl/jukijosenozi.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/typical_antipsychotic_drugs.pdfIn PDF document text
    • https://cdn.sqhk.co/xobitabab/2ichbGa/smash_bros_ultimate_dlc_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/icjfyq8/squad_vs_zombies_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/dYJ0gh9/80625394745.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ghhijjf/rekeluziwuxumanikofara.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/jgeoHji/oxygen_level_chart_altitude.pdfIn PDF document text
    • http://forkidsshop.online/what_does_the_4th_step_in_aa_meanjljj5.pdfIn PDF document text
    • http://italy-small.space/245686918909zyha.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/hi_point_9mm_carbine_trigger_job.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/80853638708.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/monuroken.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/93244598807.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/why_is_my_electric_fireplace_blinking_e3.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/40628241959.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/resolution_of_berlin_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/80490728655.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 5160 bytes
SHA-256: 1f07b08b57ec010d2182261a621eb3ffd68c07c412150217329599199c016ae8
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10620 bytes
SHA-256: 720c7e95a91662281d9f0c3718e89115090e2dbf81a3577be1bd728d24d863b7

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