Malicious PDF — malware analysis report

Static analysis result for SHA-256 487fa35e7b7c364b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 21:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d357450039dc6d5cace17a832d526667 SHA-1: 56a34020d05ee7a47924af800e50e76366c47de1 SHA-256: 487fa35e7b7c364b24825bb8e4f6a3b384f92507da06ccf64c75561e359a7b22
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 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=american+anthem+us+history+textbook+pdf PDF link annotation
    • http://xunetokawetik.sportsontheweb.net/coefficient_of_friction_formula.pdfIn PDF document text
    • http://penakubixivali.22web.org/93014495488.pdfIn PDF document text
    • http://nozuwetenij.iblogger.org/probability_distribution_in_biostatistics.pdfIn PDF document text
    • http://tapalofaxag.22web.org/votisataroxinu.pdfIn PDF document text
    • http://witexodegimo.iblogger.org/clinical_practice_guidelines_mental_health_nursing.pdfIn PDF document text
    • http://tokujanorix.iblogger.org/washing_machine_not_spinning_properly_beko.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/fc7e6b64-3b50-4dd1-a5cd-4181a3d48154/25336056121.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/black_hole_sun_ukulele.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/manhattan_subway_map_2019.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_5e6b972cdbc4423f83b7308446708ff7.pdf?index=trueIn PDF document text
    • http://fekimemisuj.rf.gd/bronchiectasis_classification.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/how_to_replace_belt_and_rollers_on_maytag_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311c4e05-d6bb-47fc-8899-a2e22d23393d/diary_of_a_wimpy_kid_wrecking_ball_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85fe76d-0a5d-4cac-9c82-7f07cd7f4073/purple_cow_float_shake_shack.pdfIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_1c2869dcbfac47ca9877c04c7beac86e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/30299027713.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_5358c58fb5d64131ad972deb824333e8.pdf?index=trueIn PDF document text
    • http://tegikemi.rf.gd/white_6000_metal_detector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb0b39c-5ef4-47e7-b55d-86f7f00bf81b/jijibalegotiwoxewejode.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_8bdb7dde71a34c5f8504507ee6988d8f.pdf?index=trueIn PDF document text
    • http://kevarivujez.rf.gd/kosibisabafawux.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/which_english_accent_is_most_attractive.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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 5724 bytes
SHA-256: 394203f9279e761d2370f524f8e1d6a81b143b1332ea8f83136d2688b0e9074b
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 11192 bytes
SHA-256: ba52f91dbe34f3f0259c6927bd70fbd7d182c20861fb732eecd2d8c523413480

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