Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c674c47ce16665…

MALICIOUS

PDF

73.6 KB Created: 2021-05-13 04:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eb4dcff8d08ab1b8896c4ae7cf451498 SHA-1: 2776a1001b2cb960faa45267a790eb9df90560a0 SHA-256: a7c674c47ce16665e58fc97c821001f821454fe1d3e735d55bef3429842ec107
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to unknown or potentially malicious domains, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=thanks+ma%2527am+quotes PDF link annotation
    • http://nazhivy.net/givebeterenizidatab37gmd.pdfIn PDF document text
    • http://itagreen.fun/dufomevavitenozapigbz4q9.pdfIn PDF document text
    • http://proba7.xyz/zobawanudizozofa4z1mw.pdfIn PDF document text
    • http://lanizimugigil.getenjoyment.net/generos_literarios_infantiles.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/9637976.pdfIn PDF document text
    • http://dwatches.site/bbc_news_reporter_scriptlnm7d.pdfIn PDF document text
    • http://lokotahas.ru/6220894572mf9i1.pdfIn PDF document text
    • http://yesnutural.space/10326217459x3uyc.pdfIn PDF document text
    • http://thailandlove.site/girls_frontline_pco4cwo.pdfIn PDF document text
    • https://mokenexub.weebly.com/uploads/1/3/4/4/134478104/jevobazepizixelek.pdfIn PDF document text
    • http://motivawka.online/what_happens_if_your_drivers_license_expires_during_covid-19h6s75.pdfIn PDF document text
    • http://raisinshq.club/rujufov6gozz.pdfIn PDF document text
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/mixuke-biwemusamolifiv-xuxikumiju-rizibarisifi.pdfIn PDF document text
    • http://muldwych.com/ham_iv_rotor_brake_delayns8hx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9ea9cb-3b43-4d72-8e9e-2af1fdc1b4bd/96229519787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a8f5d2-e55a-4229-b953-c26aaca2bbc1/how_to_use_garmin_gps_72h.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/36013003704.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 4968 bytes
SHA-256: a5370c3e6aa6c3f2e8c50a3a9069ad7e426141a96a5674fc382183021af33e91
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10632 bytes
SHA-256: 1ead3de174b4443e850f5427386bfcbcf20be7d37c6e07bbfcf89aa170bfeaca

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