Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c2a218bc1a6790…

MALICIOUS

PDF

93.6 KB Created: 2021-04-14 00:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e496b17359e849bdd54ed66f21ee57f6 SHA-1: 510fa4ab100c7f289c7688d20a55626cc54e8fb0 SHA-256: b9c2a218bc1a67902c0740b864b7cc00b490c146c5aedebbcc2b651245e7c887
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=honda+hrx217hya+repair+manual PDF link annotation
    • http://affilateapp.online/qfd_example_pizza2jrxg.pdfIn PDF document text
    • http://laketofetujeso.medianewsonline.com/22897349859.pdfIn PDF document text
    • http://50offstore.info/hmdx_rave_bluetooth_speaker_pricetq70w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_60600cff25f19.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/64589706341gskt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_6009d2dbbbef1.pdfIn PDF document text
    • http://jalakerag.22web.org/25191841601.pdfIn PDF document text
    • http://vumejopiraxu.mywebcommunity.org/joxopuxosuxi.pdfIn PDF document text
    • http://olivamebel.com/lord_of_the_rings_books_ranked_redditsuwl3.pdfIn PDF document text
    • http://mabay.fun/69908119108e11ix.pdfIn PDF document text
    • http://babobekoru.66ghz.com/emma_zunz_story_in_english.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/neonatal_jaundice_definition.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/fd7ac03c-7e62-4c17-9de5-6a90582c0dad/what_to_do_after_overeating_on_thanksgiving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106e4047-f094-4760-b924-1700a4bbf6df/22852124348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e407253-b72a-4a14-96e8-2dfe66ec7824/patch_league_of_legends_tft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f874a7-461f-44cc-96b5-522c98b5e85b/abdul_kalam_books_in_tamil_list.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/babysitting_flyers_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b96b30b-43bc-4810-9e5e-c419cf519aa2/62586451953.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_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 5416 bytes
SHA-256: 9d182caf5833ef48a1a1fc0270ac84f7a4650a5324021f0e24b8376141141766
font_01_sfnt_off000143b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B8 11252 bytes
SHA-256: ab5bee51fe48efceba7e1d4a96f7e509138c55c45ae6deab8cc02c5b2e3e2b5a

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