Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9d644dfac690a6…

MALICIOUS

PDF

82.3 KB Created: 2021-03-29 15:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 973e6f97927d8a252ec068b023fba4f0 SHA-1: 66f3931dea10042e4b00f84eafea87f95cefd6a9 SHA-256: 2d9d644dfac690a6727ec12135da839014b89d1b53d21995715d326537c81011
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. The document body, though obfuscated, contains references to search terms and a PDF generator, suggesting it's designed to appear as a search result or document to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=2013+nissan+altima+repair+manual PDF link annotation
    • http://sifaritube.sportsontheweb.net/apicultura_argentina.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/34441651228.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/3Hq9ghL/gelutekejowokedoxekiwomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_604034b4d4204.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/haghgiz/nerf_zombie_strike_sledgefire_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445118/normal_600657b39d7ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wekajibex/c8hccid/58674273686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_605152db610bb.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/Dieigjf/sniper_shoot_strike_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/texonatuzi/cEjHNMq/clay_pot_decoration_ideas.pdfIn PDF document text
    • http://gizaripe.iblogger.org/77926490508.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/bmw_s1000rr_2020_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5ffa4e91c81d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/types_of_bandaging_using_triangular_bandage.pdfIn PDF document text
    • http://fituguguras.rf.gd/how_to_service_a_honda_mower.pdfIn PDF document text
    • http://lajefuvubesij.epizy.com/mofaguru.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/wika_pressure_transmitter_s-_10_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/juxuso.pdfIn PDF document text
    • http://xevorerokune.epizy.com/vezeg.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/bogugo.pdfIn PDF document text
    • http://vezenupu.epizy.com/juzika.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/sears_appliance_technician_jobs.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/aircraft_maintenance_technician_jobs_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/35583118144.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 5132 bytes
SHA-256: 1c6fda5e85dd272c16c0b372f134dbac0605a22f803e099af7a2c8d0cf204516
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 10456 bytes
SHA-256: c5c90322ef3b77c38b541314e0ce4f0bfe842d8c6fd4619782ebcb7c03cc5015
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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