Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d98f421cd6af805…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 20:37:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cd8e2c9b50d20c3417b54c30cc09086c SHA-1: 49a33305ca5ba9bea4711900b3bb0f384448b946 SHA-256: 5d98f421cd6af805656e1f7ec7ba7f42488b1e75dd2fe48d8f056b418978c8b2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+to+get+pure+alcohol+distill PDF link annotation
    • https://nabaduvikarupad.weebly.com/uploads/1/3/4/0/134096068/sogetuwo_biruxibofob_xemiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5fdca62016dba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5ff08bb41229b.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/goviwutemafutiluvot.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/6189450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_60032737cb001.pdfIn PDF document text
    • http://mugisawitunolaf.iblogger.org/vefabegojokapedusufi.pdfIn PDF document text
    • http://larebalin.mypressonline.com/world_map_outline_printable_a4.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_does_yeast_infection_affect_a_woman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac096bc7-75b9-47dc-91c1-ae1597247b98/does_stealth_attraction_really_work.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/mudosotupoga.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/replacement_hose_for_shark_rotator_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff35c646-fd4c-4c0d-877e-88788ee28e39/how_was_guerrilla_warfare_used_in_the_revolution.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/dikarirudowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56941a32-3436-4abd-b004-ccfd0960df62/32909822343.pdfIn PDF document text
    • http://wapofele.epizy.com/emotions_worksheet_free_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8a66f7-9026-4b70-9613-b23ce40ea33d/a_few_lessons_for_investors_and_managers.pdfIn PDF document text
    • http://xiwagopa.epizy.com/18627640334.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/human_resource_management_dessler_g.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/centos_6_64bit_dvd_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/xidodudalegadufiditepug.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5388 bytes
SHA-256: dfe140dc1f90a9cffdb7b6de4091c795ae4ff5a903354d4fdec34e46ea6954bf
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10592 bytes
SHA-256: 5422d3b5eb7827ac174f05dde666b5722039311ed998e61114e3946cc3cb3ee2

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