Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cce7c8302eb8f8…

MALICIOUS

PDF

79.2 KB Created: 2021-06-01 11:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ce82d9b052f8fb1e80f0335959d73287 SHA-1: a71d00ce8646da155931f61a958d6ce8fc5702e0 SHA-256: 51cce7c8302eb8f835f4c9ae2ab8bb907fba74e87e6277f5c6d0a00a281443b6
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Apex Legends'. The presence of numerous external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/pbw?utm_term=how+to+run+apex+legends+better PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387929/normal_60618b999dff9.pdfIn PDF document text
    • https://sobomimaseneke.weebly.com/uploads/1/3/1/3/131379860/zosot.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/1815686.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/5965c9fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc7530e543a6.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/1926711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5fd0a159a87d8.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/70bfe47c22b.pdfIn PDF document text
    • https://pebitazoma.weebly.com/uploads/1/3/4/8/134849778/78632.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/sirixakiguludituna.pdfIn PDF document text
    • https://razijidepafex.weebly.com/uploads/1/3/4/8/134891772/getut.pdfIn PDF document text
    • https://jogapemufa.weebly.com/uploads/1/3/4/4/134492880/8711762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_6007a43adbeb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fd34d1cf06f7.pdfIn PDF document text
    • https://jesufapupu.weebly.com/uploads/1/3/4/7/134764637/cc4431ed0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifesepapo.pbworks.com/f/how_to_get_relative_frequency_distribution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146e9446-beb4-4b7f-9d0f-119aeead3fb8/how_to_wash_maxi_cosi_pria_85_max.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144451710/how_to_find_the_area_of_shaded_triangle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a9ad47-5fbc-4ad0-bf47-86e1c3eda756/how_to_be_a_good_team_leader_in_a_call_centre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5cf3722-7a2d-4fcc-881d-5ef0322bacd9/calvin_and_hobbes_wallpaper.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144423546/71954007477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888a5ead-f01c-450e-b09e-41e070038f2c/7950132284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00cb702a-ec00-4ca1-b435-73bbb5770871/beginner_violin_sheet_music_free.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/8060219288.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 5388 bytes
SHA-256: add34a43d667f4b90df679793d609237001fe47dfea321243e60942603dad95f
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 11340 bytes
SHA-256: d135163851f251bdbd8f1489ff45ff689aedc558f6fd06ec774de746a8761c2a
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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