Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca5886a89e6d8bc…

MALICIOUS

PDF

87.9 KB Created: 2021-04-22 00:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c20cd47c2eb01a635489190d1a95c915 SHA-1: 77621f0a9f650123980e632c1ef9f8bb43680def SHA-256: eca5886a89e6d8bc67f8dd8017ed618188f23f6cadda5ff1ee8f538a72b45203
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 embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on low-reputation hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/strik?utm_term=panorama+summer+baby+monitor+no+signal
    • http://dujojiwasemob.mywebcommunity.org/vaxogisizaraxupelozorudu.pdf
    • https://static.s123-cdn-static.com/uploads/4479718/normal_600745dce9002.pdf
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5ff757241e00e.pdf
    • http://xasumemazekejo.scienceontheweb.net/scientific_management_in_public_administration.pdf
    • http://kufomabid.mywebcommunity.org/11460057718.pdf
    • http://fejukoturig.medianewsonline.com/wewufevavokaf.pdf
    • http://nesorus.mywebcommunity.org/how_to_trade_forex_strategy.pdf
    • http://rawoxaxevog.mygamesonline.org/bomemenax.pdf
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ff6bdf87272c.pdf
    • https://cdn-cms.f-static.net/uploads/4452594/normal_604b15a9c464c.pdf
    • https://cdn.sqhk.co/retesixabe/hjdQicC/vufotu.pdf
    • http://kemedejovon.getenjoyment.net/borderlands_la_frontera_gloria_anzaldua.pdf
    • https://cdn-cms.f-static.net/uploads/4371497/normal_60446b269d800.pdf
    • http://mamubisuk.mypressonline.com/gosewigofudiwus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kefodek/docket_sheet_pa_court_common_pleas.pdf
    • https://s3.amazonaws.com/pilazi/why_does_my_key_fob_keep_beeping.pdf
    • https://s3.amazonaws.com/fizaxo/66831821262.pdf
    • http://dijejewilibafux.onlinewebshop.net/time_management_in_the_workplace.pdf
    • https://uploads.strikinglycdn.com/files/01716db2-6abd-436d-88f5-52084006d7dd/apush_amsco.pdf
    • https://uploads.strikinglycdn.com/files/e35f9827-996a-48d7-8f84-c41e2f687cea/gobobojulotovubozugifet.pdf
    • https://uploads.strikinglycdn.com/files/01f4fe00-3306-47b9-8c04-25395fa66dc2/bomanezetevobaxinazowe.pdf
    • https://uploads.strikinglycdn.com/files/8642f9d9-bc3e-491e-ba6b-92ae23963e71/what_are_the_ancient_egyptian_gods_names.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_off00010cb4.bin
d5777965ea26be72807171c15194c3b4fb52943003c7a57c08b988a7d1378f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 5128 bytes
font_01_sfnt_off00011e10.bin
a8b2b4f9465398ccfd29d8e1f37e8ccb28d47b73d4e19f9a11219d6a70722062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 11184 bytes
font_02_sfnt_off0001440d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1440D 4324 bytes

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