Malicious PDF — malware analysis report

Static analysis result for SHA-256 c131dcfeb6f51a41…

MALICIOUS

PDF

78.5 KB Created: 2021-03-15 13:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8713b74d6b10839de0dc7ba4ab427d6 SHA-1: 7401d6f40924edad3275d5467339051bed9cfa90 SHA-256: c131dcfeb6f51a41fc18ceeee3770654dc8f0d8019d1158fd2f14964661a5555
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs like 'https://nipisod.ru/wix?keyword=linear+algebra+crash+course+pdf' indicates an attempt to redirect the user to potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=linear+algebra+crash+course+pdf
    • https://cdn.sqhk.co/vufisolepu/habhaob/roblox_god_simulator_2_hack.pdf
    • https://cdn.sqhk.co/wiwuwigo/Xijjcgg/vemaz.pdf
    • http://trychambre.xyz/546402540459g6lv.pdf
    • http://votixibutiro.medianewsonline.com/timerotomodedolola.pdf
    • http://mojofaza.mypressonline.com/pejukodomatifiweloluxewi.pdf
    • http://shop-kid-toys.online/ejercicios_de_anualidades_generales_matemticas_financierasylhq0.pdf
    • http://zitalogeloluwiw.mygamesonline.org/malthusian_theory_of_population_growth.pdf
    • http://ketrovk.xyz/novodubifelc8nz8.pdf
    • http://xifasiv.getenjoyment.net/easy_touch_test_strips_how_to_use.pdf
    • https://cdn.sqhk.co/vilonunufuk/ljb3C3t/becoming_a_sub_teacher_in_texas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c561163-f90d-47cd-b52a-be61fc3c6165/abu_garcia_max_z_spinning_rod_and_reel_combo.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_b9b383d489bb4ec5b76f9e33597eb32b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3a48cfa-6bf5-4582-b64f-97d08e7357b3/devogez.pdf
    • https://s3.amazonaws.com/lixasifasi/2016_gmc_acadia_slt_owners_manual.pdf
    • https://s3.amazonaws.com/xukonakefules/98666247828.pdf
    • https://s3.amazonaws.com/pivetuzadujo/how_do_you_use_loreal_hicolor_highlights.pdf
    • https://uploads.strikinglycdn.com/files/553b29b5-5995-4c3f-9f72-e35864e58836/peavey_vypyr_tube_60_problems.pdf
    • https://s3.amazonaws.com/gaxuremewuger/cbo_full_form_in_tcs.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_1ba39aae007e4cd4bee0698991f5b0d9.pdf?index=true
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_bff8219eb45d4c968452574e38f8e973.pdf?index=true
    • https://uploads.strikinglycdn.com/files/180090a9-5514-4d79-ba6d-93cca455dd94/wuxupe.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_off0000f329.bin
e7b3e5bcc5c26ddff20fc4ff8bb9a935147308846a9df2bfefbd617027ebe708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 5496 bytes
font_01_sfnt_off000105cf.bin
28544c03d2a58401fed90d668d6cf9043c94df9965a5b7198aa78a738b6dc060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 11388 bytes

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