Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29d8dca05110d95…

MALICIOUS

PDF

77.9 KB Created: 2021-05-10 12:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d23ff29e3a8ce1fa7eea21c3af9bcb46 SHA-1: 14f9d19c3a39eac802c70a3ceb1426f8feb000a5 SHA-256: b29d8dca05110d951d7427ea318df9c0571cbea30e220739ddcc4741abedd8fc
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 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 0.9997

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.
  • 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://seumenha.ru/strik?utm_term=scott+pilgrim+vs+the+world+game+2021+release+date PDF link annotation
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/264855.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/ligafobibetiji.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/8169985.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/8049437.pdfIn PDF document text
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/4766878.pdfIn PDF document text
    • http://torchqbfl.fun/how_to_turn_off_ice_maker_sub_zero2s1as.pdfIn PDF document text
    • http://dfwshootersupply.com/bopematinuwiwonqb6p.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/4435265.pdfIn PDF document text
    • http://magic-spring.com/28097428202iuo70.pdfIn PDF document text
    • http://dragonflysagewellness.com/714478147296o3he.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/febe484b-bbc7-406e-84f0-638daeead09c/how_do_you_reset_the_control_lock_on_a_whirlpool_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d85191e-e983-4303-91f4-0430db9dde29/99438732291.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_8129454fced04776818055b55a00efb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e62a8ce-fd37-4029-9763-29bb92487538/xerox_workcentre_3325_factory_reset.pdfIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_b3c93dc88dfd474da72115228082e6c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa462a70-d032-4cc4-a777-6b2b4e785621/how_to_upload_a_pic_on_snapchat_from_camera_roll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754a1d83-79f3-4124-85a3-55287cb54336/what_is_the_best_macbeth_movie_to_watch.pdfIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_0aaa661634524e74aa128a8f7f3bb146.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_ce609d8e49da449eb22f598aa13b1cc9.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_b09cb7d4049c49a184159b0454eab0f8.pdf?index=trueIn 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_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 6068 bytes
SHA-256: a287173b9840cbf7c8bc5a0b860d5a5bed78abee81d971df982bcb84c3f69bea
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 11532 bytes
SHA-256: b87574aed5bdacafbc679741458bf160e30d6ecc1dab48fcf56bb17d3d60e1e6

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