Malicious PDF — malware analysis report

Static analysis result for SHA-256 83042027f06290bf…

MALICIOUS

PDF

65.7 KB Created: 2021-02-18 04:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 928b014c2cc1130f52d5bd6e452eae92 SHA-1: 376c92dfa4a4428c42b13f4635b6ec915123483e SHA-256: 83042027f06290bf9eb628244071ce59cfefebf5058b1cc74877e9aad5bf43be
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://baarspo.ru/wix?keyword=races+of+renown+pdf', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/wix?keyword=races+of+renown+pdf PDF link annotation
    • https://josubolifixit.weebly.com/uploads/1/3/5/4/135400154/sefez-kotumot-gebobid-nivukuf.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/fulutibenuni-rivaxabaril-nuzurobib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456660/normal_5fd932511f347.pdfIn PDF document text
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/vunolorazisavak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_6017269a0c8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_601868a2e879d.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/8da7c7bf.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jdtmhe9/29861494805.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/2c7065ea47fcb2b.pdfIn PDF document text
    • https://pagevexositikul.weebly.com/uploads/1/3/5/3/135327712/14caf8fab6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_6014ab3a55742.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/vukusa/beths_grammar_school_sixth_form_open_day.pdfIn PDF document text
    • http://sogonuvusawi.epizy.com/new_tamil_movies_free_hd_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wood_burning_stoves_guide_buying.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/hotel_del_luna_ost_full_album.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_off0000c4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C7 5216 bytes
SHA-256: d0977e6867dd880a8a599c7654d3109e762066bc65f63596b09347dd4553e523
font_01_sfnt_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 10432 bytes
SHA-256: f3003c641bb7146731d2ec01edccb05b84c71cac3443dff2fba787d944c65f79

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