Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc967bbe2e0fcec…

MALICIOUS

PDF

76.5 KB Created: 2021-04-01 08:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdbbf956f72f9abf0f20b859e9a66803 SHA-1: da9ab06bd102b6907dc0d48581c43d75c8998cd3 SHA-256: efc967bbe2e0fcec465d49d093f89bdbe23a46889d3cbab81b55c1d61f5f9af4
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 0.9997

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://fokemale.ru/123?utm_term=sharp+lcd+tv+troubleshooting+manual PDF link annotation
    • https://lijemokuw.weebly.com/uploads/1/3/4/8/134853622/varamezada-bunasalafevux.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/717da09ca.pdfIn PDF document text
    • https://xexonuza.weebly.com/uploads/1/3/4/3/134305788/7974008.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/6965567.pdfIn PDF document text
    • https://nodudovipum.weebly.com/uploads/1/3/4/7/134711526/savaposeb.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/quantum_physics_book_in_hindi.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/zalezivekomux_bokaligidewodir.pdfIn PDF document text
    • http://pemojubeku.iblogger.org/printable_immunization_form_3231.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/16eaf4f9-f14d-455c-8e23-e6f37ffe2e45/33177803874.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/pinuliseliremo.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/colt_ar15_magazine_review.pdfIn PDF document text
    • http://bovubibuba.epizy.com/rt-n12_vp_default_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db27b007-eb35-44b8-a9ff-3af6bfc9df35/kigugimoxerutuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a55786-f996-43fa-81db-08d4cf8522ae/lumokul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159abd64-4fa1-4c46-89d1-b8c8006a5c91/2435575362.pdfIn PDF document text
    • http://suwetiwojiza.rf.gd/gali_chirugali_dj_song_wap.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bunac_uk_entry_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcc2e1b-cc29-4572-8533-68fc7a9e5fc7/3066751838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94568ec9-52cd-4258-a07d-972e9c80b5e2/sevugesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40660c92-657a-4813-a2f5-8103db3928f2/greenberg_advanced_engineering_mathematics_solutions.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_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 5792 bytes
SHA-256: 4aeb15125a248aa066a455669ce1b028419cac0bbf56661ac75f2066464c2d9d
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 9928 bytes
SHA-256: d4963611b1bdade90b998d1af1186e792f4533723d5c7310152ae592b7a74b85

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