Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5216bd84403c4f…

MALICIOUS

PDF

86.3 KB Created: 2021-04-27 11:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb48f0a87483dc11f3c530f6d707771b SHA-1: 9456fe53eb3d92a54f9842948fe0cecd4834dbb7 SHA-256: 3e5216bd84403c4fd7cae788ee8b1e35ee0f1272f064540c2b13f0f7011a9b02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating a mass external PDF link farm, with one of the primary URLs being `https://midufefew.ru/strik?utm_term=waiting+for+the+barbarians+movie+synopsis`. This URL, combined with the document body referencing a movie synopsis, suggests a phishing or social engineering lure. ClamAV detection and an ML classifier further support its malicious nature. No scripts were extracted, but the presence of external links points to a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=waiting+for+the+barbarians+movie+synopsis
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5ff3e2184dcf6.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_603aae31f3998.pdf
    • https://cdn-cms.f-static.net/uploads/4382614/normal_6023f9b853ad7.pdf
    • https://motabuwupogofe.weebly.com/uploads/1/3/1/6/131607229/88e042c2.pdf
    • http://natorg.fun/dofetitesigoruxukuk5e45.pdf
    • http://itsamorem.com/xefobiwunag3bc65.pdf
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/6225231.pdf
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/dulewebizepagixezowo.pdf
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/28cb3eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/julexekubaj/60633658047.pdf
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_59c424f9891549438584fe6028200de6.pdf?index=true
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_1eecc5de880645a389c9569e631926e0.pdf?index=true
    • https://s3.amazonaws.com/xepululejiwof/google_form_template_sign_up_sheet.pdf
    • http://wobemiko.epizy.com/assamese_singer_babu_song.pdf
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_698fc318fdc449eca7d5dc6017b5a4a5.pdf?index=true
    • https://s3.amazonaws.com/toniseligiwuzux/81621429768.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_5b410b824fab4620b133b6cdbeb89ee1.pdf?index=true
    • https://s3.amazonaws.com/nisiwanolom/helter_skelter_vincent_bugliosi.pdf
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_bac5f7745f66429cbd45e51d670ca21d.pdf?index=true
    • http://fepesori.rf.gd/muxatonojanuxizag.pdf
    • https://s3.amazonaws.com/veraxawewib/does_samsung_s8_get_android_10.pdf
    • http://pegalisijeg.epizy.com/perimeter_and_area_worksheets_grade_6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001044f.bin
7d5297edc4509a56de0c1ba0d4b3ba4ac261d5587266ce691384d3810270e661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 5384 bytes
font_01_sfnt_off00011681.bin
33766597babf27c37522f7a154e1126c640c3ca6bef3f179ff3edfee3ad5a6ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 11460 bytes
font_02_sfnt_off00013d9c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9C 4324 bytes

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