Malicious PDF — malware analysis report

Static analysis result for SHA-256 51175641ea702faa…

MALICIOUS

PDF

70.1 KB Created: 2021-03-18 03:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c6534f01118dc20fbfc548a118b126 SHA-1: 7585d371551e2494cbda9d5577a17b0e57554b95 SHA-256: 51175641ea702faa97fdecd30d10475aa96afaa379c10d7a40a6ddd115391a04
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests an educational lure ('Chloroplast and mitochondria worksheet key') to mask the malicious intent.

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://jumiwimov.ru/123?utm_term=chloroplast+and+mitochondria+worksheet+key
    • http://migarosovimopem.22web.org/elements_isotopes_and_ions_worksheet.pdf
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/naxorupune-lutukil-bitibituwawa.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601681abbb820.pdf
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/gadelexivumapek_susiwi_jajilaligup_dulujixunaj.pdf
    • https://cdn-cms.f-static.net/uploads/4494436/normal_600ccb4bde184.pdf
    • http://degujub.iblogger.org/esl_reading_worksheets_free.pdf
    • http://olymptrade.buzz/falabixatigimeriap003.pdf
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/xorilerewaxanekubi.pdf
    • http://badge-verification-center.com/what_to_eat_for_vegan_weight_lossrlqx0.pdf
    • https://kixifosesezor.weebly.com/uploads/1/3/3/9/133998007/xonawep.pdf
    • http://cleaner360.shop/pirufiparanagenasulio48g2.pdf
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/667353.pdf
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/bomenopukarikolupi.pdf
    • http://prodson.space/673694127140xmdf.pdf
    • http://mscredit.info/matijuwakufarofv6xh.pdf
    • http://sobakin.space/bilaspur_railway_station_platform_numberq9hsb.pdf
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/junujola.pdf
    • http://rameautbxy.space/rukaminirolorutizivmf3o.pdf
    • http://net-klientov.ru/213210554858lbap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pukimovusi.rf.gd/xuzolalaronugizapexi.pdf
    • http://meletediso.rf.gd/muredewowedabuw.pdf
    • http://mugosovexu.epizy.com/tadadofulobivez.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_off0000d646.bin
69390408e6cebfc39bf5de02fd17c088f407dee072ea6327a858ffbd29633eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 5476 bytes
font_01_sfnt_off0000e8c9.bin
59e1966a097915b67ce389f6880cef06eff25740102cacf0fd4b9f3db6111b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 10000 bytes

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