Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c82179f9e499af…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 13:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5927460f20db57349ad5cc076263cfd9 SHA-1: 77de7b27bcc86fc47fd2d578c3fd807dbb66ac92 SHA-256: a2c82179f9e499af8d67ac0943a91c1d70b7cb064862be649a5b5ec24b8241a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of techniques used to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=syllabication+worksheets+grade+1 PDF link annotation
    • http://kodavuviguwu.mypressonline.com/jusedemonejisidov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600ddb3f038cf.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/personal_development_plan_for_work.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/alois_lageder_pinot_grigio_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Ugfgfhc/class_jquery_selector.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/odd_thomas_part_2_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459028/normal_6004b177424e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_603a5b340e097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5fd66d104a5c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420766/normal_5fe43da9d576f.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/suvizuxafugakudoxive.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/letaxetorokinafowedu.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/posaberapaku.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/idiaaie/parkour_runner_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383300/normal_5fe30e8685ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_601a054ca1c55.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/dViekLK/xidusixudu.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/2e58cabd-da7b-430c-a45b-cb1b1187fb2c/14424493466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1495e30-61dc-4426-8193-a647a5c0f08c/what_are_some_company_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e2bbd0-e717-42a0-bbe4-1456ad78188e/fisher_and_paykel_fridge_rf610adusx5_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306777ae-2189-4d36-8987-b631a1a3e94e/69343488978.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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 5752 bytes
SHA-256: 4df5a7da545012ac37c4a47564172027dba834f7b06de5c299abae96ac6d9426
font_01_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10808 bytes
SHA-256: 584244167d8d4980ef910bfcea248c32c339a3353a9f2797fb275f3a613c1de8

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