Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc22d209ce86b17d…

MALICIOUS

PDF

77.9 KB Created: 2021-02-27 04:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 71c6c116de58fa138a6241f6092f866f SHA-1: cda574b118b284872d147e76b9a95bd2ddeffc99 SHA-256: dc22d209ce86b17d9203c42cb93de6888718c9946da8be4cf98c4a67b4de89d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://jottigo.ru/award?keyword=old+yeller+book+ending PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418747/normal_600c6fe0b6f1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe0994b52d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380383/normal_6034d73c3faf5.pdfIn PDF document text
    • http://fb-ig-violation.com/xivaromixya5r0.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/how_to_draw_books_for_9_year_olds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476566/normal_5fcd313c714c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60120bffcb0b6.pdfIn PDF document text
    • http://urolog.xyz/dijevoxupajozixia7ljl.pdfIn PDF document text
    • http://particulieres-societegenerale.best/7659039621qf46p.pdfIn PDF document text
    • http://jususozosowi.22web.org/american_history_museum_division_2_loot_boxes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fd067eed8831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_600c0e92c2201.pdfIn PDF document text
    • http://rusakova.space/logic_riddle_questions_and_answers4f59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fe91624a65ca.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://sixosotonipo.epizy.com/bojari.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/i_am_not_perfect_but_i_am_limited_edition_meaning_in_urdu.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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 4648 bytes
SHA-256: e6603e80d0b93c3b28c5d055b0589255d409fa737bf277545f8597cec3b0ea71
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10424 bytes
SHA-256: 88fb3e086263d71e392848686004d01aedd115714f6eb05705ce67b6211ee6a5
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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