Malicious PDF — malware analysis report

Static analysis result for SHA-256 705d941449a0a0f2…

MALICIOUS

PDF

77.0 KB Created: 2021-04-17 19:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2cca055b6ac7b6f962cc5a46783f4fd SHA-1: 2050c10be3bd28f69975ddcad1301770d512bf24 SHA-256: 705d941449a0a0f25b8c150754608e490facf1b7e5570600a2905d329d6c1524
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+build+your+own+walk+in+cooler
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/8074687.pdf
    • https://cdn.sqhk.co/dagozuwemep/NjjicL6/cafe_boombana_mt_nebo_qld.pdf
    • https://cdn.sqhk.co/zopizote/tSjeLKf/26173642410.pdf
    • http://megidexabaror.mywebcommunity.org/dotumulokesukutorugizuve.pdf
    • http://zeruzatuton.22web.org/new_sat_bubble_sheet.pdf
    • https://cdn.sqhk.co/rewaloxuruvu/4PoRmVE/2224318706.pdf
    • http://veduxaze.iblogger.org/dipirisowidusikolofere.pdf
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/2826834.pdf
    • http://tezibif.mygamesonline.org/donorowelomumoxurawu.pdf
    • http://beviluxenumiliv.mywebcommunity.org/menawa.pdf
    • https://cdn.sqhk.co/dijadive/OtidpbY/70219001616.pdf
    • https://cdn.sqhk.co/titolegun/goPgjfl/zudaburevuf.pdf
    • https://cdn.sqhk.co/vejuwozigef/fhfbFfS/juzelelajimiwefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xalexojaxipud/20794960078.pdf
    • http://pabewuvuxaf.onlinewebshop.net/yasin_suresi_trke_meali.pdf
    • https://s3.amazonaws.com/retobifulipo/rodokuko.pdf
    • https://s3.amazonaws.com/vigevot/votosusesusa.pdf
    • http://vigukesege.epizy.com/godilutujokexaxuzazaluwo.pdf
    • http://buwepuxaj.epizy.com/cute_and_funny_whatsapp_status_video.pdf
    • https://s3.amazonaws.com/vonusirukete/vishnu_sahasranama_download.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_off0000eed8.bin
5aadb2107f5b514a502ad448d91300a14f53d8ceb6073948b66ca48714e88af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 5112 bytes
font_01_sfnt_off0001005e.bin
27fbb3d4a16ca5161d1b551fdb278ef444bf1fd6a5302bdcf134a9806ec7be97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 11228 bytes

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