Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5305620c193edba…

MALICIOUS

PDF

74.8 KB Created: 2021-04-13 16:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67a67af5d0aafae0f1063bd4d84b2ee2 SHA-1: e27ebc1c28f9e5503a82d118d54755678f59fdfb SHA-256: a5305620c193edbaedc9bc998a5b82762863fb909fbf868fbe6645d88c8bdc2e
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://vilenefex.ru/strik?utm_term=julius+caesar+by+william+shakespeare+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368224/normal_606e8288350a3.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/captain_america_first_comic.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/dunanitizoxudogov.pdfIn PDF document text
    • http://gusebozaromurel.mypressonline.com/97883058497.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/kebawupaxeboku.pdfIn PDF document text
    • http://dumagut.22web.org/nolusenilejigo.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/tracheostomy_care_protocol.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/are_simple_molecules_soluble_in_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_6054e88fc0e2b.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/bengali_calendar_1423.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/29008016028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetixeguxiji.epizy.com/l_histoire_du_cambodge.pdfIn PDF document text
    • http://buvozosasubatib.epizy.com/analytic_geometry_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9884f892-177d-4af9-a47c-25bf096a5c54/93055600014.pdfIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_eb3a3dce5c3f4bc18ecd4246404d19b0.pdf?index=trueIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/pesituzolenilunese.pdfIn PDF document text
    • http://kopevevax.rf.gd/22771782679.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_d3b13042456545029a7a1f882d9f2097.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2bb55b5-2fcf-4e85-bf44-4c0e0c06814d/big_little_lies_season_2_cast_changes.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5560 bytes
SHA-256: b4665d33694603ded085479593775ee8b4473f22ffcb12dee1a5a26952bfdf62
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10768 bytes
SHA-256: e3341e3a032d64337c278cf390fc615c29b26201bdb719a65d6160d96a510c4e

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