Malicious PDF — malware analysis report

Static analysis result for SHA-256 d587b27b857ce334…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 09:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a694f163e0f68fbe9b8c165966beca8 SHA-1: b645d07754a7f3153b226124e51d98cf20ba811b SHA-256: d587b27b857ce334fd6d447668e482e48077217507424c49551c31060f777ad2
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect the user to a malicious site. The PDF document body, though heavily obfuscated, suggests a lure related to academic discussion questions, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=ralph+waldo+emerson+nature+discussion+questions
    • https://static.s123-cdn-static.com/uploads/4452608/normal_6005820ed17df.pdf
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601ff1b02eb3e.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603711c903c61.pdf
    • https://static.s123-cdn-static.com/uploads/4367303/normal_5fca793d51a9d.pdf
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fd68b13d01ff.pdf
    • http://sibogufurab.medianewsonline.com/pinulog.pdf
    • https://cdn-cms.f-static.net/uploads/4489411/normal_602d38add76ed.pdf
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fc7551721aa0.pdf
    • http://girepodemaz.getenjoyment.net/12096885371.pdf
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6000a2d45709b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_f14b918a80774b1a8ad1f0e48ef13bde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d29ecf0e-f193-4473-a7c7-25eb05fecd69/68038137861.pdf
    • http://rabatelekovufar.myartsonline.com/32372425566.pdf
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_3e3f32f7346e40a68f8573ad888bf4b0.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_064eda28a12f4b95ab745bff944206ad.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94eb8c1f-7e61-4aa1-b7b3-d3667b06ae5e/mireg.pdf
    • https://s3.amazonaws.com/bokexizometun/reddy_heater_30000_btu_kerosene.pdf
    • https://uploads.strikinglycdn.com/files/0cad37d6-5dc6-4d97-acda-a145116aee03/harry_potter_and_half_blood_prince_game_crack.pdf
    • https://s3.amazonaws.com/pidufozu/83879494794.pdf
    • https://uploads.strikinglycdn.com/files/0e1b8ad1-dc17-473f-9672-c9f2f389c2d0/zofowojuzaxemekisawumen.pdf
    • https://uploads.strikinglycdn.com/files/94a91335-4a14-4c98-bdac-ce83a508ea36/81068292203.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_off0000f02c.bin
e4528ccf8b5e6ab29cd46eb3906f8426c4f9c8ffdbde2c1aceb8ad558cd6f051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5536 bytes
font_01_sfnt_off000102e5.bin
8b3bbb68ae3bd67bd32a0ddc5b1bf48cb0544f383c35ad28af95a97b46d5bbc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 10724 bytes

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