Malicious PDF — malware analysis report

Static analysis result for SHA-256 4576304a918bde16…

MALICIOUS

PDF

73.6 KB Created: 2021-01-28 10:04:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 821bf87e82c99775eda95c8227287fbe SHA-1: 6891042ba1010aca8811bfdb407c5a425e4efafd SHA-256: 4576304a918bde16ea277f850ef5fea2fe513f42aa23f312638e35698e6f62bd
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed for SEO manipulation or phishing. The heuristic firings, particularly 'PDF_REPEATED_PAYLOAD_LINK_LURE' and 'PDF_SEO_LINK_FARM', strongly suggest this document is a lure to deliver malicious content or redirect users to malicious websites. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://jacksth.ru/123?utm_term=chelsea+green+wwe.com In PDF document text
    • http://bandalet.club/kavafegelarigezadak2p8oe.pdfIn PDF document text
    • https://niwogowepovem.weebly.com/uploads/1/3/4/7/134767936/fasomokowex.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/ianihUW/49144741449.pdfIn PDF document text
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/jexumibilas_doxamuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ff828faace03.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/lilimuripur.pdfIn PDF document text
    • http://edayafar.xyz/las_7_enfermedades_mortales_de_la_geuk2pv.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/fy3rUhh/archery_games_shooting_balloons.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/009287fb4c858c.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/caca8f3eaa5c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jinatopa/gdav9id/fall_coloring_pages_for_adults_with_dementia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwunepozu.epizy.com/guroligumogawuxiletinimu.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/50600521020.pdfIn PDF document text
    • http://rojapamun.epizy.com/2005_chrysler_sebring_convertible_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/menemazewusutivad.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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 5240 bytes
SHA-256: 567d4c270e6481167822b9f24253ee4b5ab8039d578aa6d10a4ddb01119514cc
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 11088 bytes
SHA-256: adbb1689e1b7272d13dca0a3dddfd765b342450e347b355d1dbe49290ddfd29b

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