Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c5387ccfd9919f…

MALICIOUS

PDF

72.1 KB Created: 2021-06-09 14:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 96995f7a5da090766130685907b36a44 SHA-1: b461b18bb55d40d958fe018f5a30d4a23c37a32e SHA-256: 22c5387ccfd9919f1500fb4b8021ba72b2947b6bf244a3cfbcd9be40aebe3492
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many hosted on disposable domains. The PDF_SEO_LINK_FARM heuristic indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious external sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

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://medvor.ru/pbw?utm_term=instagram+booster+followers+apk PDF link annotation
    • https://demewegib.weebly.com/uploads/1/3/4/8/134867988/e22716c015e.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/b5a7f347c14.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/4031212.pdfIn PDF document text
    • https://revekabidumuki.weebly.com/uploads/1/3/2/7/132710675/6991136.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/4206651.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/bojan.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/7952560.pdfIn PDF document text
    • https://riwubabefos.weebly.com/uploads/1/3/4/5/134591520/2975925.pdfIn PDF document text
    • https://rafexalubez.weebly.com/uploads/1/3/4/3/134311016/158f879.pdfIn PDF document text
    • https://jafowunasakubiv.weebly.com/uploads/1/3/1/4/131437393/tiwizetimide_nurukotas_nagojezovo_rijopabir.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/susuvubenelipuxiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144660645/personal_cash_flow_projection_excel_template.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144655332/xujafonefasawovubewibo.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/vimuxakuxilotode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc8accb-4c16-431c-b275-24ecc5ab0f32/runorepekesuvawosakedade.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/totakukizeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56b9fd5-2056-422a-ae8a-714016ca84b2/lixofewozexodemosaroxu.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144504654/how_to_shuffle_tarot_cards_reversed.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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5452 bytes
SHA-256: 7c8c71854c09a305d05a6c2af4201948ce1262adbad2940fba812b45158c35dc
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 10756 bytes
SHA-256: 896908d6e84a72064d4216672f8c88e568effb690954ee1348be181ea56981eb

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