Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d8d398fd20d4b8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-02 14:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d7eef0026b5a48df9c8e757166e2522e SHA-1: c9293ca2625a45006ffc10a263f2cfc2346ad9e7 SHA-256: 22d8d398fd20d4b8af04443982d8b658d355fb941bf658d595574e820e9a9b1a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, appears to contain search query text, and numerous external URLs are present, many hosted on disposable domains. One URL, 'https://jumiwimov.ru/strik?utm_term=how+do+i+reset+my+water+filter+on+my+samsung+refrigerator', suggests a lure related to common search queries, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+do+i+reset+my+water+filter+on+my+samsung+refrigerator PDF link annotation
    • https://cdn.sqhk.co/pisomuma/ZaiaIhj/porevok.pdfIn PDF document text
    • http://megalit-korolev.ru/how_to_answer_do_you_think_questions0jg3s.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/guvapenerivebokuton.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/cjdhfc5/68242813622.pdfIn PDF document text
    • http://ru-dev.xyz/todugitixenosuwijeper8j801.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/9553575.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/vitoleriwodenivot.pdfIn PDF document text
    • http://look-hotel.com/16885456641lhg9p.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/XaNifhi/nejudaxesaravovudopim.pdfIn PDF document text
    • http://batmbatm.ru/94846618217zungv.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/is_25_a_milestone_birthday.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/engineering_drawing_ka_question_answer13yuc.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/2002_buick_rendezvous_service_manual.pdfIn PDF document text
    • http://boost-shop.xyz/nemopirigopotawaxii6art.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/ifRbBnb/phone_number_hacker_simulator_online.pdfIn PDF document text
    • http://paksorond.xyz/4276075967wsj24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bogalibamadom.myartsonline.com/wuwawamavuxabe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 5264 bytes
SHA-256: 74f0ce1bab4a87501e2e73cb5d98be6ef90f107bad01b3db0e381663e6ba064d
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10572 bytes
SHA-256: 3a544edb6e5768de3bd5ccf655d2dfa22e538f021690364557475ef52486ea82
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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