Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc65398f5d029ee…

MALICIOUS

PDF

74.8 KB Created: 2021-04-21 13:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 80fdc348b453e39e3c11bd09fb7086a4 SHA-1: 940e245d10eeefd62f3c25c56e2fe897ad01b505 SHA-256: 1dc65398f5d029ee101e79329151faedde5b0a1aabbca85434de47747e108560
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a search term related to a discontinued product, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=fitbit+flex+2+discontinued PDF link annotation
    • http://ionatr.space/what_are_some_environmental_issues_in_south_americaek9ju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_601de1459eb49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_60156330a099d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fc87e4cb3461.pdfIn PDF document text
    • http://molotkov.site/zemifozafeluxebexiwexvsdz6.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/hernia_umbilical_cirugia_pediatrica.pdfIn PDF document text
    • http://fartook.online/how_much_oil_does_an_international_dt466_takedy64t.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/how_to_determine_shotgun_shot_size.pdfIn PDF document text
    • http://jupofara.22web.org/35157756021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_60319b129f1e0.pdfIn PDF document text
    • http://blacklaser.ru/79611223932jlfr4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizuwabezuje.epizy.com/50665424408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6c5941-ac68-4469-a9de-5b33c74ce4ae/leadership_theory_and_practice_northouse.pdfIn PDF document text
    • http://kujafugakare.epizy.com/xubafuwurut.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_b22b4b07716d4e068cc24baa46435a92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf77dbf8-e83b-4c48-850c-ac65e0c25b98/maze_runner_2_free_online_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79f8195-9e6b-4de9-b097-74ddfb0a1f96/how_to_write_a_scholarship_essay_about_yourself.pdfIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_06268d284ee94f84811eaaf0010671bb.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_1b5fe6b9685142c5930563d6053ff401.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_8aa56dc18a3d4e24b4cc6524aa28f48e.pdf?index=trueIn PDF document text
    • http://vininotubosom.epizy.com/88570183028.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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 5004 bytes
SHA-256: 2a7cecdfbc19f53827a160e568d97c09cca508dd16d6d973b4e6d87872aa8f6d
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10444 bytes
SHA-256: 97f206db8f40bedddf19f8c36be68153ed1919e6d4d2b1bf8a08f7e3697ca937

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