Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cc58ff8cf875c3…

MALICIOUS

PDF

72.5 KB Created: 2021-05-19 02:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4f8da0f906b27565a27cc402ca2da112 SHA-1: e9ab28365191ecc9386a588721ff0ac65aab6c13 SHA-256: 33cc58ff8cf875c3b4cd44433db7722ae69f5c83777b358533a6f7e0dd212fd3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=jadu+ka+ilaj+book+in+urdu+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464735/normal_5fe1a03545cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_60120a329aca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498330/normal_606e21d2e9477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421201/normal_602a575b672eb.pdfIn PDF document text
    • https://ribupawotomimam.weebly.com/uploads/1/3/4/6/134694318/58d508f48c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fc990702ec0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fe8d8b913962.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/4bd3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_6047af2ff3638.pdfIn PDF document text
    • http://vulupexemuv.iblogger.org/hp_bios_beep_codes_3_long_2_short.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fd08d3692918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fce30dbb3eb7.pdfIn PDF document text
    • https://berezudimideri.weebly.com/uploads/1/3/7/5/137512898/labavuwemegubupus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/welcome_to_shadowhunter_academy_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/56162600935.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/truck_driving_school_in_new_york_state.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/doctor_who_scripts_for_sale.pdfIn PDF document text
    • http://visejatuvun.rf.gd/connotative_and_denotative_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/oxford_medical_dictionary_free_for_pc.pdfIn PDF document text
    • http://xogegusubo.rf.gd/the_beggar_s_opera_script.pdfIn PDF document text
    • http://sejofinudagiji.epizy.com/xadikasakarewugenesovel.pdfIn PDF document text
    • http://vowukuzu.rf.gd/kawagapefufonage.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 5124 bytes
SHA-256: 7c00d5402758c06f6a630a626554aa7f600cf09c48d94394e5fd991c0d4cf17a
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10868 bytes
SHA-256: be91d6e007481878b3edffcebe6455c301fd968688eacb550403e876864b43fe

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