Malicious PDF — malware analysis report

Static analysis result for SHA-256 142da7ac65653695…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 22:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd7d0e7f7614aa373df18dfcfaab28dc SHA-1: 5138c717d8977e03a86d2bee1abe2915be60df09 SHA-256: 142da7ac656536953270cb6f70b22aedbbbaacd25291f70b52d51cae01acec62
126 Risk Score

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 0.9993

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://dugedepap.ru/strik?utm_term=9th+grade+vocabulary+list PDF link annotation
    • http://rorejidefozuroz.iblogger.org/xipazezidadexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_6062463b63902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5ff94833a4f08.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/e5875c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_605d5eb4e9ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_60090f84a5a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_602f97e1cfef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fd3d9434fdeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fe788ab29ad7.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/zelegafaxa.pdfIn PDF document text
    • https://xonatusapu.weebly.com/uploads/1/3/5/3/135391421/7672710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_5fd787f2039cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_606466ad99580.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/glycemic_index_definition.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/wabet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5fe1c7ca24a3b.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/bpsc_non_cadre_applicant_copy.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/33f3fdbe-7991-4d11-91c8-e780fe44bc4f/anet_a8_settings_for_cura_4.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f9f186-2698-4d72-8a4c-5919144bfd8d/does_dish_offer_discounts.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/96959199907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed011e0-834f-4991-9373-73e9ef6c7574/introduction_to_american_deaf_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c370bf-da29-4f2f-bdc0-093d246d90db/onn_32_mile_walkie_talkie_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7b5c97-e44c-4cce-a738-431eb4877ff3/skil_20v_cordless_circular_saw.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5564 bytes
SHA-256: 4ef2477e71183f4692de292bffeb24a22373b0e009c2b0885269a51b883ca248
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10444 bytes
SHA-256: df6fe32a9e3b55f72105481ee326c1e6fed4f2d9a7bf440a4cb2c264bf92b885