Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f7b0fb795adce7…

MALICIOUS

PDF

69.9 KB Created: 2020-12-18 00:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 247ee8ea630d438d5144a1a754a85c1a SHA-1: d6fb61034fcffa1930fdd0aa724805a6ca4eca6a SHA-256: 20f7b0fb795adce790624c01077e7ea689a70f6812a8ffa4707f6e11d014010e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one prominent link points to 'traffking.ru'. This suggests a link farm or redirection scheme designed to obscure the ultimate destination, which is likely malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=type+x+drywall+data+sheet
    • https://cdn-cms.f-static.net/uploads/4500208/normal_5fdbd7b4d1164.pdf
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/2271160.pdf
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/6938106.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_5fa7c2e873ad3.pdf
    • https://static.s123-cdn-static.com/uploads/4458621/normal_5fc41503300b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee77ec0a1d2b4e5440f5/1606217335866/the_us_public_owns_about_acres_of_rangelands_in_the_11_western_states.pdf
    • https://static1.squarespace.com/static/5fc2985d3dfdd95b60dfe79a/t/5fc50d3e61e25426e1d747a2/1606749503268/18580409217.pdf
    • https://s3.amazonaws.com/jinotugiwomo/37351493804.pdf
    • https://s3.amazonaws.com/divelatoxa/download_app_for_tcl_roku_tv_remote.pdf
    • https://static1.squarespace.com/static/5fc2f4402e537a05ef168230/t/5fcceb7cd235d37878c69857/1607265148429/planetary_nebula_definition_nasa.pdf
    • https://uploads.strikinglycdn.com/files/590a4ec4-1455-4807-9b1b-b0016e485de9/xtreme_brite_brightening_gel_watsons.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd307aa1a3e16100fb58de/1606234235489/v2_pro_series_3_cartridge.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5002cb3e0f577146095e/1606373379235/jixetabadiwiv.pdf
    • https://s3.amazonaws.com/mogipegi/jingle_bells_choir_sheet_music.pdf
    • https://s3.amazonaws.com/legobegutulo/free_android_emulator_for_macbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c798.bin
d17bb22cb4bd26f6a314724a9543cd73f7beeae09a96f3dbbbe7de19fb7de96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 4780 bytes
font_01_sfnt_off0000d808.bin
fcc0876deff52039818019511314ce2120ae4b5ee6d88aaf6b76a17c8da1e70f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 11396 bytes
font_02_sfnt_off0000fd0b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 4324 bytes

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