Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5666a89ce127769…

MALICIOUS

PDF

99.5 KB Created: 2021-04-04 21:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 51f728961b9263ed1e82d012c0be429b SHA-1: 8744b46ceb063d2e5c2ccc7a31b39f3c9e99ce28 SHA-256: d5666a89ce12776927223358ca4fae964f89dda5f9cb1b2728683d2b65d2cec6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external URLs, one of which is `https://jumiwimov.ru/strik?utm_term=kung+fu+panda+characters+as+humans`. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=kung+fu+panda+characters+as+humans PDF link annotation
    • http://kunepuvobimamin.medianewsonline.com/arqueologia_industrial.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/36740220826.pdfIn PDF document text
    • https://tapenori.weebly.com/uploads/1/3/4/6/134657753/7955680.pdfIn PDF document text
    • https://tutowori.weebly.com/uploads/1/3/5/3/135317166/jemixobabevoj.pdfIn PDF document text
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/zujasajogux.pdfIn PDF document text
    • http://kefets.xyz/11622930341jt7n5.pdfIn PDF document text
    • http://ch-redirect.icu/14954549022219vi.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/53691292167.pdfIn PDF document text
    • http://siteznakomstv69.space/nodunuwuvofuwigot27nr.pdfIn PDF document text
    • https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/9282719.pdfIn PDF document text
    • http://magic-spring.com/travel_to_santorini_greece_in_october8og4i.pdfIn PDF document text
    • http://lojasamericanasbr.com/incir_reeli_2_indir_yandexlu25w.pdfIn PDF document text
    • http://pay-order.info/71326265361yl17.pdfIn PDF document text
    • http://specrazreshenie.com/human_anatomy_and_physiology_amermanwotid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kofabube/what_is_basic_electrical_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/37554506958.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/30739485818.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_off00014916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14916 5508 bytes
SHA-256: 4b9593ae30f90271054b32c43b89a7a0c3260fd5646ad168eef2a0a58bebe693
font_01_sfnt_off00015bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB3 11280 bytes
SHA-256: 20efb595815c881ff3cb250aa9c912a60354b8117131dc3291a6defee75f11ed

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