Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2951ba2cd61854…

MALICIOUS

PDF

108.0 KB Created: 2021-04-08 05:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44caf6fcc461b2c49a8ee0761b72508 SHA-1: d5404e0b181c7d15f6e57c1bfb81e6e05ee1f2cb SHA-256: 8f2951ba2cd618542989f3132acd30b6f234bad8982e45d70546a010591775bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, many of which are suspicious, including one pointing to 'midufefew.ru'. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=mid+maryland+football+rules
    • http://topcreditscore.info/22323688508lgqdt.pdf
    • https://cdn-cms.f-static.net/uploads/4449974/normal_604ccad85d719.pdf
    • https://cdn.sqhk.co/kamozipu/dIgdTQw/move_to_sd_card.pdf
    • https://static.s123-cdn-static.com/uploads/4381291/normal_5fcd268223d9e.pdf
    • https://cdn.sqhk.co/mopomotop/lijjghf/ms_project_free_download_32_bit_with_crack.pdf
    • http://webdefilmizle.com/626066857427epkm.pdf
    • https://cdn.sqhk.co/wavagowew/gcKephi/daily_checklist_app_iphone.pdf
    • https://cdn-cms.f-static.net/uploads/4452612/normal_60482158d0611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_3a63587ed14d4e9da2ae7833bd6e5015.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_91c75fbf3d7d400bbf8ca9f2da615c84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f952ba4e-bfcf-4502-a5bc-a59925dfe2e4/fifty_shades_freed_watch_online_free_youtube.pdf
    • https://uploads.strikinglycdn.com/files/d8c2fe79-f09b-45b3-ab32-b727b10d4f6d/what_is_the_passing_score_for_cfa_level_1.pdf
    • https://uploads.strikinglycdn.com/files/f1cf739c-26bf-45fb-a01d-45c6fd4c1c37/creating_flowchart_microsoft_office.pdf
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_478afbb6935e4b3d812d1f7eec606cef.pdf?index=true
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_c9c8ace861794e4b844ec7ca507dd5a9.pdf?index=true
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_1dd90f91aed546e99f867f33bd059b77.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_ceada8028cba47f696b7849fb2b3454b.pdf?index=true
    • https://a89564a6-40c1-4e73-a7e9-9a85f261709d.filesusr.com/ugd/b371d9_6ed28e5db2d640ceb780978fac16dc42.pdf?index=true
    • https://uploads.strikinglycdn.com/files/00f4a859-a96f-4863-a2e8-1b2f4ff4b28a/batixobowik.pdf
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_348cc490b47f430791e08e32192f2ea0.pdf?index=true
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_03ed06f152f54637a6fb224a5306a197.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b7aa57e-230b-4e89-a0eb-9358c3671c1f/ripemasunotozipafune.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_off00016953.bin
86c6e38ebec0245bc70608e7de26aea02359d548784a66e51cc03e80dda514f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16953 5300 bytes
font_01_sfnt_off00017b4f.bin
230c7f859a1843c55fd1584ff4f5657efe615443bef2240ff5551bf265bff0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4F 11192 bytes

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