Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe87da8c2845d483…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 12:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 46ca22d7b5c6c9393c98fd09e9c61800 SHA-1: 42dbc55a1a5b6d6fa196bb5adf7eda6804510752 SHA-256: fe87da8c2845d483894c2a93af7d1b1f6a63f393d33deac400adc4ab977f3624
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The primary URL, https://jumiwimov.ru/award?keyword=berlin+city+sightseeing+bus+map+pdf, is likely part of this scheme to drive traffic or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=berlin+city+sightseeing+bus+map+pdf PDF link annotation
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/96ed5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6016c46b0c65f.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/darkness_visible_mumford_and_sons_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/WijGijp/namiruxiwe.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/arc_hydro_groundwater_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/AghUjdz/tabletop_fireplace_indoor.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/24038775776.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/jhjdh0V/46086211934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379377/normal_5ff434c24fcab.pdfIn PDF document text
    • https://kenafidoragakox.weebly.com/uploads/1/3/1/8/131856022/9225b8e10de.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/fjcjhVf/pasimidu.pdfIn PDF document text
    • http://wusator.mygamesonline.org/34258325935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_22d476456068450ebee4d3adc4deb217.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_09c7d3f995e9410db584e3fd15145fa8.pdf?index=trueIn PDF document text
    • https://97e6e6c8-040d-427c-ad66-6ef02350ae38.filesusr.com/ugd/9c523c_d7987249103943088608f27d2e515095.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2872b3-04c3-4551-8c6d-80fc22eeb206/army_weapons_qual_promotion_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4cade86-3bef-4a66-ba71-d8cb76c3e5d6/zirepatogubipowejabega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337ba0a8-e821-4a22-bd96-525a59572a8f/pakixikuwusugadirufe.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2b83dc28933441418ffc4f73944109ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0dcba0-2bd0-4dee-aa38-6cf6770a1c6f/star_wars_the_old_republic_online_game_time_card_60_day.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_ed46ee9551f042d98452a9ab3c8aafbf.pdf?index=trueIn 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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5860 bytes
SHA-256: f6d0ca64f09fd3c3e92061615d35e4d87bf859d390dab92781fb265a71a7a653
font_01_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 12072 bytes
SHA-256: 612865c641a0d7195528c285ae199cba9d9b9fab527dceadb90cf3511b0d9f05