Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c28f24c279929f…

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 05:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217e1414e60f08064e8882e3ba5efff7 SHA-1: 44605b4648cf97b2ebe5cac952b54b60dd3b2f36 SHA-256: c6c28f24c279929f060368d0c6ea784e1ca8e1a0dacf6ce4f739abb04e45243c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, with one prominent link pointing to a PDF file on a suspicious domain, suggesting a link farm or redirection strategy. The document body, though heavily corrupted, indicates it is presented as a timetable, a common lure for phishing attacks.

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://dafemum.ru/award?keyword=adelaide+metro+train+timetable+pdf
    • http://wirobigi.medianewsonline.com/normalidad_anormalidad_y_crisis.pdf
    • http://zuxekagapefe.mygamesonline.org/calculating_slope_of_a_line.pdf
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/julili.pdf
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/diwovafexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_912bb3c347c94f33b181ca7c25c2ddc1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/adbe2075-3667-4774-a863-ed197db295b9/ratipawimura.pdf
    • https://uploads.strikinglycdn.com/files/6d8216d0-e0ac-4303-a423-b718d51e3a10/5_love_languages_worksheet.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_ff5834e2b4c24f9995689a71674001ee.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_5ddbb659037e4326bf682943d8fa2f9b.pdf?index=true
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_8c0320e6c68b4c6a9f43e5d6592589b7.pdf?index=true
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_744b4d72c56c4d9ba33b4f5208f996b3.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_032e546201c243819386a7dd40179cc1.pdf?index=true
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_74a8d9e2d206428ba7dedcc3950540cd.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3b1a1e894dda4fbeaecf83aa8b847231.pdf?index=true
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_17312a2bb8024d8c96a023101ca4bb31.pdf?index=true
    • http://nimanexobubibub.onlinewebshop.net/aines_dosis_y_presentacion.pdf
    • https://uploads.strikinglycdn.com/files/26018d5b-3d9b-4215-b0fb-baf2b7510f50/international_business_degree_salary_per_hour.pdf
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_4109e54336c846d090718b84b9d3c261.pdf?index=true
    • 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_off0000ceeb.bin
3f345a1e050655914c75c78653681ca052c0617e32d2210eeb5db205c9345463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 4928 bytes
font_01_sfnt_off0000df88.bin
e6e68d04a86c7fc275c474de87c3e0ff931ba09371fc9b9daaea3ec898dff4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10344 bytes
font_02_sfnt_off00010305.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 4324 bytes

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