Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b55b430b56e9d4…

MALICIOUS

PDF

87.3 KB Created: 2021-03-20 03:56:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bd8cb174f08d7c95777e5fbecb4b2ba5 SHA-1: 55fb31937ff5a86f32ff50108741746b5741148f SHA-256: 84b55b430b56e9d4a1e70786d26e43e688d3ab0868a32b25709c6010b85e48d1
186 Risk Score

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 0.9990

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=washing+machine+lint+trap+lowes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fe727cd594b3.pdfIn PDF document text
    • http://rawuzexo.iblogger.org/may_2017_international_sat_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_6015562a67066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6001011573bdc.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/carnatic_music_book_for_beginners.pdfIn PDF document text
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/kolalijujan-serirulowaribo-xekebedimegefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_60296ae477d2c.pdfIn PDF document text
    • https://newogevalofa.weebly.com/uploads/1/3/4/8/134898908/viwekesiroje_munuzupaputidi.pdfIn PDF document text
    • https://vonufire.weebly.com/uploads/1/3/4/5/134596457/dukobiluk-tebepuzimavese-wakosaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384822/normal_5ff175bf3fcec.pdfIn PDF document text
    • http://pewujok.mypressonline.com/feperamimogobijawak.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/170d7801-5d04-4813-a621-9a69dfa05082/business_math_curriculum_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387d4e20-dd9c-4808-92d5-291fee4519a7/2007_jeep_grand_cherokee_transmission_problems.pdfIn PDF document text
    • http://wolevovugubim.epizy.com/xemiwodaxuwoxufateve.pdfIn PDF document text
    • http://tiwobera.rf.gd/8_tesis_sobre_el_neoliberalismo.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/how_to_find_the_solution_set_of_a_quadratic_inequality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad01f0f-caaa-46e8-a228-1c945a481b6a/nomixozimawuginomureka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdfa66d1-ab0d-4c0f-a50d-3b427cba4490/ap_worksheet_00d_elements_and_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/sosolegulidozaforo.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/is_it_safe_to_walk_around_mexico_city_at_night.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/how_to_set_sony_dream_machine_icf-c414.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/factsheet_or_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe35ebf-054e-4c91-82c3-8f7e9ae72833/kavilenamuwi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 5452 bytes
SHA-256: af721d67b0667cefa4c8d785db5029b84609801c11513cd0f2bd829a88b66ec7
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 10840 bytes
SHA-256: a838706fbb06328d3fda84f2ff1022d14a15beb63ed18f18161c9d2518db958a
font_02_sfnt_off00013a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A79 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b