Malicious PDF — malware analysis report

Static analysis result for SHA-256 43355a1f34394a8b…

MALICIOUS

PDF

82.5 KB Created: 2021-03-14 14:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ae651a1aaf09bd8d15b4baa827851f7 SHA-1: 90e1b3a7c9bf5672d8cfec1a12436b4c8e8e5dbf SHA-256: 43355a1f34394a8b149817f6b0048fae17b39bbde6ff3351178649a8c7996e0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains a question about ECGs, likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=how+long+does+it+take+to+have+an+ecg
    • https://cdn.sqhk.co/datolabevev/Jjdibms/36987530449.pdf
    • http://olymp-trade.top/why_am_i_hungry_but_my_stomach_is_fully8xs1.pdf
    • http://fito4ka.xyz/pomukawoninafebabevefujwjbto.pdf
    • http://stavki.link/57877253552ijvj0.pdf
    • https://cdn.sqhk.co/fekesolip/Zok8HZP/67473442302.pdf
    • https://cdn.sqhk.co/loxexafetivu/dUChjig/robots_des_moines_iowa_weather.pdf
    • https://cdn.sqhk.co/kunimanujage/VXgdlPM/lotojakafura.pdf
    • https://cdn.sqhk.co/mobobelelu/eMUOXgh/2639212607.pdf
    • https://cdn.sqhk.co/lotivadafe/eghhjcs/69139550712.pdf
    • https://cdn.sqhk.co/lelogivotosu/aZhdXgj/72362629054.pdf
    • http://makamar.xyz/what_were_the_religious_beliefs_of_ancient_greece5oqx2.pdf
    • https://cdn.sqhk.co/sawibevas/hegg9ia/sculpture_falls_access_point.pdf
    • http://heretythere.site/nineputafubiwukagynzgn.pdf
    • http://getsalon.xyz/79005309368klggz.pdf
    • http://nanolenka.xyz/romeo_and_juliet_1968_and_1996_balcony_scene_comparisonrgqlx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lemefofutomapox/67299431897.pdf
    • https://s3.amazonaws.com/gogunabones/buttocks_workout_free.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8a399d6b3b6041e79f58986ce32e9d14.pdf?index=true
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_4d0a763e610c494686541f58739e6ea3.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_78e538246bc0419192501d2d86335f03.pdf?index=true
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_2f2a8df470384e13aff4896dc263be46.pdf?index=true
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_5d8dd616b3884c34ae38d56567d4eb23.pdf?index=true
    • https://s3.amazonaws.com/jixerubowi/98247419261.pdf
    • https://s3.amazonaws.com/xilasisefi/google_maps_api_key_react_native.pdf
    • https://s3.amazonaws.com/legenapi/mejatajeror.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_off000106da.bin
7c484ee487e641e10c461a92aeec76343535b996d2b4f87917c78dc516c31fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 5284 bytes
font_01_sfnt_off000118ee.bin
7cc4a750a4536e4188fbf10196f9010573a4b0578391a08aedb19d0d7e727ae0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 10468 bytes

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