Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd588a2fb46ca495…

MALICIOUS

PDF

70.3 KB Created: 2021-02-11 13:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 020b582793a2de13b005313aa73805f0 SHA-1: dc220085c86afb07bc9af7ea57572c440bc85e7a SHA-256: cd588a2fb46ca4957a9f14c76895ce44e9682f6d0df5b711ee0442f01b0c49fe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=adobe+dreamweaver+updates PDF link annotation
    • http://meetsoda.pro/sejejidixinumifek4l92i.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/zupomaso.pdfIn PDF document text
    • http://educationonline.website/gikepezulubatukisifenofxds.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/S3dwioP/disorderly_definition_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/gc4Bjid/90049451537.pdfIn PDF document text
    • http://barashik.space/az_dmv_abandoned_vehicle_form16m0b.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/cYjeia2/boom_boom_football_hack.pdfIn PDF document text
    • http://samozanyat.info/the_book_of_coming_forth_by_night_mi6pcea.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/Nicgcjc/dovegofusewowipilaxikar.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/iAhahbG/uber_food_driver_app.pdfIn PDF document text
    • http://birjand.design/jalowebajawowinlsge3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5ffe14addf442.pdfIn PDF document text
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/tubobupasepo-nejinenaj.pdfIn PDF document text
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/naxafagatelevagek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/lalipisu.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/demonstrative_pronoun_worksheets_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/batman_arkham_city_apk_free.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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 5352 bytes
SHA-256: 4e9f7ea56b3a3bbaeb0c2e95c10bc8e2f5c25e303340abea2f8180ae72b40291
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 11004 bytes
SHA-256: f16e16608ab2479fc5fae559f5c6bef3ecbf152da19a67827861a9f2702ca4ff

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