Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25f2ae49a8684b2…

MALICIOUS

PDF

86.5 KB Created: 2021-03-23 15:24:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c070a6b4e436111a8400afcb4e58d7 SHA-1: b86127458b9492e7f892fb865a99f568188aab1b SHA-256: a25f2ae49a8684b2a1fe5e93123199fdeaf9d63f8344d5bf8b59d0f84e19ef82
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on cloud storage services, suggesting a link farm for SEO manipulation. One of the extracted URLs, 'https://lozipotod.ru/123?utm_term=ir+table+functional+groups+pdf', is flagged as suspicious and likely leads to a phishing or malicious site. ClamAV detection as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=ir+table+functional+groups+pdf
    • https://cdn-cms.f-static.net/uploads/4460946/normal_602c0b0b9fc7c.pdf
    • http://idealica-ordina.site/bomelu5zjc7.pdf
    • https://cdn-cms.f-static.net/uploads/4444113/normal_5fd9591e1362e.pdf
    • http://doordash.link/22801363330utnmq.pdf
    • http://organic100.fun/college_entrance_exam_reviewer_with_answerlpvjs.pdf
    • http://todayshop.website/kadebidutotogudrkokv.pdf
    • https://static.s123-cdn-static.com/uploads/4411701/normal_5feb82c99aa84.pdf
    • http://winsl.space/ralidirebodiweznzadq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rerinago/90636763572.pdf
    • https://s3.amazonaws.com/xeropizuwe/87477316507.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_868cecc0aab94408bf142d4d46a06657.pdf?index=true
    • https://s3.amazonaws.com/sefiwegegagu/free_printable_wedding_rsvp_template.pdf
    • https://s3.amazonaws.com/vuterijoze/what_is_the_best_music_to_dance_to.pdf
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_b7ebded58f4149afa6d44f0ebfb0d3ce.pdf?index=true
    • https://s3.amazonaws.com/pegozegi/cantina_band_piano.pdf
    • https://s3.amazonaws.com/buxoparadazegu/how_do_you_do_answer_in_english.pdf
    • https://s3.amazonaws.com/ponivotigegepub/samsung_tv_remote_control_instructions.pdf
    • https://s3.amazonaws.com/xefezesebusu/noir_chronicles_city_of_crime_pc.pdf
    • https://s3.amazonaws.com/fibesezati/counterparty_credit_risk_management.pdf
    • https://s3.amazonaws.com/nuruvapozixix/abhinetri_tamil_movie_songs.pdf
    • https://s3.amazonaws.com/fotepopunaj/why_is_my_washing_machine_not_getting_hot_water.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113cd.bin
c862bf9d33c2af6545415ea3ccf18cc64009ce34c183eebd4d73e2c66368eba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 5400 bytes
font_01_sfnt_off00012630.bin
148ab585ae301222a7278a2365ca3f7a65770b1ecc277e60082bd38cab8212a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 11244 bytes

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