Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12f7741a9fc26ec…

MALICIOUS

PDF

76.2 KB Created: 2021-03-31 17:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5645b2dabf4d8040d68918025aae313f SHA-1: de295a085593bd20fd12d0da3de47f519f3768b7 SHA-256: f12f7741a9fc26ec2e39b0e464a78181df4fcd72044e6f303e7d416be65223f1
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting domains, suggesting a link farm or redirection mechanism to deliver malicious content or phishing pages. The PDF's structure and embedded URIs indicate an attempt to disguise malicious links within seemingly legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=six+characteristics+of+refugees+ap+human+geography
    • http://fomijegi.mypressonline.com/99574339120.pdf
    • http://wumewil.sportsontheweb.net/24593131825.pdf
    • https://cdn.sqhk.co/bexefoboxevi/Fhjhb8x/96297853207.pdf
    • http://dekiweragaf.mywebcommunity.org/vufodaw.pdf
    • http://uaregroup.com/zamoxitubalejosewubevu9biil.pdf
    • http://mmeueue.space/onan_marquis_gold_5500_manual3bp0x.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/fcd07d4a.pdf
    • https://cdn.sqhk.co/vipujitebiki/fmhihj3/66474027490.pdf
    • https://cdn.sqhk.co/tejosepu/snhhhj6/58248871084.pdf
    • http://mosomupusafebin.medianewsonline.com/top_startups_2020_london.pdf
    • http://islandlandscapesbb.com/35207639487jxeb8.pdf
    • http://gigezesuzobe.getenjoyment.net/sujegosov.pdf
    • https://vazexisosumufil.weebly.com/uploads/1/3/4/4/134465451/2ea5dd.pdf
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/0663648ab2.pdf
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/sakofesoravaxabodixo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nerezusilanake.atwebpages.com/ceftriaxona_blau_bula.pdf
    • https://uploads.strikinglycdn.com/files/6ab91c47-99c4-4312-96f3-698f2f917041/symbol_ls2208_rs232_driver.pdf
    • https://uploads.strikinglycdn.com/files/ac3466ef-c31f-4928-a47e-fea62a3cf6d0/nixokobebu.pdf
    • https://uploads.strikinglycdn.com/files/23ad8af3-8afc-4cdb-b6f8-eabb6b7fbc59/nuvi_2597lmt_update.pdf
    • https://uploads.strikinglycdn.com/files/f0035a51-b27e-4304-8d45-2864792ce420/apc_smart_ups_2200_xl_battery_replacement_instructions.pdf
    • https://uploads.strikinglycdn.com/files/f68f3b0b-99fb-4cc9-bf67-89f62989d2d6/jesus_and_the_disinherited.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaee.bin
1ffe9990291fdc724a4c8a1bd98c7186c8acce81f23f577ee3be6d38da5d5021		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 5668 bytes
font_01_sfnt_off0000fe28.bin
2806b16cd4c8958f3215ce31091f19cd4216adb8fa86ff31647c2866a1d6b060		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10824 bytes

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