Malicious PDF — malware analysis report

Static analysis result for SHA-256 df357a404a47b56b…

MALICIOUS

PDF

65.7 KB Created: 2021-03-01 12:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b506f4233101ee9653944a09b4474544 SHA-1: 170f605d74c83856c74401dfd95da4226234d5e3 SHA-256: df357a404a47b56b4160bae21af21aef0d142b88953b0c14db58d85d86062756
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 0.9998

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 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://gimoguvi.ru/123?utm_term=windows+10+free+upgrade+from+home+to+pro PDF link annotation
    • https://cdn.sqhk.co/vomisape/chbvjjT/pukewejug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5ffd3a24934fd.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/digahdf/nimevupatarelawedud.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/mean_from_a_frequency_table_exam_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_603c517f60b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_60137d06a9f2f.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/romivawolezomo.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/iiifig5/75543415254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mamesejo.epizy.com/software_cracking_tools.pdfIn PDF document text
    • http://fodudedokuka.rf.gd/58789271937.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/a_levels_chemistry_tutor.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fast_love_letter_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/plantas_endemicas_del_ecuador.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D4 5724 bytes
SHA-256: 902b3d8a02e3aec6016f85e2e52df30d07a0911dac3abd02c3d99cb97d494d4c
font_01_sfnt_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 9868 bytes
SHA-256: 15362d489971d50af6b82918d2d95c1ae75b3e2546bddcd1465d1dcdbffa2c84

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