Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b64d957e08efcf…

MALICIOUS

PDF

73.5 KB Created: 2020-12-18 07:03:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41671f29a46e4b227c612988e3560201 SHA-1: 60f7f73f5496204e42da8a49b783f468c1d4c7ed SHA-256: 37b64d957e08efcf6e74b0ffd11f0dac43691b9a3f60582c2c0904058effe3bb
156 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 0.9998

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 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.
  • 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://trafficel.ru/strik?utm_term=george+lopez+show+episodes PDF link annotation
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/jarafozusarexu-vopodabimejes-nolazopolelu-motipej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5f96cd912b2fe.pdfIn PDF document text
    • https://jezulusawuse.weebly.com/uploads/1/3/4/0/134000263/nijarubimujinexumo.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/33de2969747d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5c3421c8c741314533f60/t/5fd16331ad61ab58317d0caf/1607557937338/airtel_new_sim_recharge_offers_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00c29085bf90c0ef85582/t/5fc2683f3f75b1664321f4b4/1606576196162/timber_ridge_middle_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8044bc2e-71ed-41b2-90ef-14c6fcf015b3/motion_forces_and_energy_science_boo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2c7225-3315-4e29-b0e1-239991a243d6/26901713161.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c2ac8ef7301f8b3249da/t/5fd636a8de5b1220c0251c3a/1607874216469/bootstrap_angular_app_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/99317815134.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ef808845d092480d7e0/1606373112984/wutoradataziberikega.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19ff392c50b1a1e7ca808/t/5fcffac23679834d723c680f/1607465667019/wingstop_locations_in_pa.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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 5184 bytes
SHA-256: 6e69705bf1d076ffc6880f70b9071e1eb64fe0d89fa7acf9e2b1faa764ebedbc
font_01_sfnt_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 10284 bytes
SHA-256: 99fe2eb04fb50bd99c94edd58e4ff2dde2f607c701ba57fdbffc7d441bbdf1c0
font_02_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 21384 bytes
SHA-256: 7392e0cddeaaa3eb74e35ba5dba7b7651e5fdeb0c1f3cfbe65e3c08207de7f2c

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