Malicious PDF — malware analysis report

Static analysis result for SHA-256 438704eea35bf1a1…

MALICIOUS

PDF

81.5 KB Created: 2021-05-08 06:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5ae7132c57a54bf3cda053529c95e3f SHA-1: 2afae8a80636b69cd154b4f1c38b5f006a824b97 SHA-256: 438704eea35bf1a1b4bbceb5a38eaf7c012f40997d42dd588f567f9ce21a4c35
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 0.9996

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://pelibifir.ru/strik?utm_term=epson+wf+7510+ink+cartridges PDF link annotation
    • http://art-practice.org/zugubadukijulopuwjba8z.pdfIn PDF document text
    • http://reduslim-italy.site/rumuwa2891n.pdfIn PDF document text
    • http://7lessons.fun/dozemaritesotixasars5nty.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/44287413506.pdfIn PDF document text
    • http://pornbustyvids.com/80177248696ofkhn.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/bissell_little_green_proheat_instructions.pdfIn PDF document text
    • http://sellamorem.com/romance_of_the_three_kingdoms_xiii_trophy_guide3dgjn.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://terem.space/caste_certificate_application_form_bengalihr8mx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_9ad1cb22adb74b8b80d75635ec5bd085.pdf?index=trueIn PDF document text
    • http://jiporiri.rf.gd/gst_accounting_in_tally_erp_9.pdfIn PDF document text
    • http://kikivalisexe.epizy.com/etiology_of_gestational_diabetes_mellitus.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_4cf558b8f1e94353aa4505dde8e165e9.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_5943328acfdf42a6b32332242979051c.pdf?index=trueIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_96a970ac67594cba8a02c901ca299937.pdf?index=trueIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/social_media_advertising_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6905a008-cdd8-4fdc-825e-70be75e336ad/echo_srm_2100_carburetor.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/learning_apache_flink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3115fddc-f872-414d-9757-3a7d2508fc0d/what_does_it_mean_when_fedex_says_package_not_due_for_delivery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5df6ec-69ad-4279-8b18-717047ed1a0b/76635709423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f34c6b7-e747-490b-8dba-92fa435cc6d4/xepetifikavukemogov.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_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 5804 bytes
SHA-256: 669d566c5e128df4e0ecc0f868c3a1b2506b385b51021aa2d9968cca5c28cf7b
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 11224 bytes
SHA-256: c217e6493582f1883390abb21e013a1abf0ff38f2ea57b366779c9a2e8f62c6d

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