Malicious PDF — malware analysis report

Static analysis result for SHA-256 8936d2e86ed0cea7…

MALICIOUS

PDF

73.9 KB Created: 2021-03-28 11:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 649e9508c5e8d8cccac4f72303ac7c98 SHA-1: 145fa61d6be60a9692cb087f89e7934817b8c30d SHA-256: 8936d2e86ed0cea7b11c1bf5ca46aa2d58da43e656095a11b349f35d68d7cc03
186 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 0.9999

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://bologen.ru/strik?utm_term=word+meaning+programmed+cell+death PDF link annotation
    • http://inter-kalinka.ru/no_opp_left_behind_lyrics_meanings7gn9.pdfIn PDF document text
    • http://spindlndou.space/19447600060wt96y.pdfIn PDF document text
    • http://helpforteam.com/kiribelizavobiropinuteguayxwz.pdfIn PDF document text
    • http://sodaapp.pro/reading_rainbow_episode_listdr6fk.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/37183146183.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/rabewiruzitewa/baldurs_gate_3_multiplayer_not_starting.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_74857e4f501f4bb3bdd1af61c0257d33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/323baf11-3b58-4094-b0b6-402e36cb1757/how_many_watts_does_a_60_gallon_air_compressor_use.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/pathfinder_bestiary_2.pdfIn PDF document text
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_52cecec2ef584db0818ef04aa6d466b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a995bf7-cee2-45e8-be11-324562e258b2/dijiwolobelajatipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ff1257-2e6e-42de-aafb-8a43e7479117/end_the_federal_reserve_petition.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/table_calculations_in_tableau.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7149aaca-ff2f-4426-82b7-3ac2c8bdddd6/difev.pdfIn PDF document text
    • http://wejufudedolu.rf.gd/14562961655.pdfIn PDF document text
    • http://desiwafinu.epizy.com/cloudformation_validate_template_yaml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c952a524-8a47-4831-8dbf-ffc08ba22ba2/how_to_calculate_energy_efficiency_rating.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/class_8_civics_chapter_2_answers.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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 5320 bytes
SHA-256: d85da03887f0e4b76229d27673d80135671d0b5a2db9f4a5358312219782af4b
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10996 bytes
SHA-256: 50affd775cb8af9733e510c565b1e15a7fdb1584db93416103f4aadc47c3abe2

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