Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ab18986f42dd56…

MALICIOUS

PDF

75.0 KB Created: 2021-03-19 16:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c331f17154b6519592af67981210159d SHA-1: 7f612255400e653eb6a6c6f586129b455756f56f SHA-256: d0ab18986f42dd56f72227998a30b3db685159f249e54c8dbc0a73c62540cdf2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and a link farm heuristic points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://xezojetit.ru/wix?keyword=bsf+john+lesson+10+day+5+acts PDF link annotation
    • https://cdn.sqhk.co/lowanivari/gighyuO/critical_path_chart_template_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5fe448398eed6.pdfIn PDF document text
    • https://cdn.sqhk.co/bimeniwog/hjgdgfU/fidget_spinner_effects.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5ff8a25a134f9.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/94128f.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/sjdgeBp/3d_printer_t_rex_skull.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6035f3e8aa0e0.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/qlcjcib/oculus_vr_space_sim.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/gLd7CiE/11656607889.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/dsjfEQx/koala_habitat_information_base.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwimid.epizy.com/10858282151.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_eca2bf0ad72247c5b52ad04586e8cacb.pdf?index=trueIn PDF document text
    • http://suboxasolu.rf.gd/poxifojeg.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_645c0a97dbb0444ca0f7e4824dd71144.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_a2df9a83f2804177b3d044d0baa2e6ab.pdf?index=trueIn PDF document text
    • http://similev.rf.gd/55127217654.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5560 bytes
SHA-256: 277ac29d72abb3745fce730e7be8c895770c3f903602348b6454070f879e1dc1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10512 bytes
SHA-256: ac75d0bf503bc441e97021692b6b4289d0050be5e2a1eb38997cf52f9d387742

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