Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c78f0513257c5ce…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 11:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56a68cd606fc61157866fd58a91922b7 SHA-1: 105c59e85a86533cbe90929baf27fd2491b5436f SHA-256: 1c78f0513257c5ceed3bb1d16c26aea5a0a64fe7fc46014005dbe29b60586579
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 domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/award?keyword=alpha+female+book+pdf PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/iiBjagi/japeposawalimo.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/JOtTrij/38960633575.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/Obihjg6/home_arcade_systems_supergun.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/pazeno.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/K4hfifr/harvest_market_springfield_il_phone_number.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/sign_of_the_beaver_book_online.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/authentic_assessment_tools.pdfIn PDF document text
    • http://xeralebusizuno.iblogger.org/isaimini._co_2019_tamil_movies.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/jijumupade/comparing_decimals_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34782ca0-398e-4fdd-9793-46762c81119c/mekotebugojulus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d48f82-e54f-4766-9dbe-d7e2ca80f72b/how_to_show_page_breaks_in_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5728f8-997a-432c-b278-e94cd2162305/87695141828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159acb2c-e532-448a-a45d-78ebac47c040/1734-aentr_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/xabesekaxasogiligizoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eefd6aa-ec6a-44e9-9b0f-6693e47a1299/95756711100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebbbd85-4c31-4e86-9015-7cae7c2e9cc5/how_much_does_an_interior_decorator_charge_per_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d992ca4-164d-47ea-8a98-451ebc2ecefb/frigidaire_affinity_stackable_washer_dryer_manual.pdfIn PDF document text
    • http://xiwaresijo.epizy.com/yahoo_female_dating_format.pdfIn PDF document text
    • http://dukizovisepo.rf.gd/97574714893.pdfIn PDF document text
    • http://gufesabil.rf.gd/tuwusiketibomobexajoso.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_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 5200 bytes
SHA-256: 6c6ea1f0bab1aa20aa8f7c0232d480f3069285404998cbd2772be793597d851f
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 11824 bytes
SHA-256: 4bce61986b9012dcf319558f7968af33591af62d013f58a73fcee6b3de03d9da

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