Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b144f292dcf50f3…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 05:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b583796cbde98b0c9791e9db92f3c7e6 SHA-1: 6646e00d6dfcd39e9bc3580ba222c346e4221cc0 SHA-256: 7b144f292dcf50f3fd1dd9727039b4382fa38c860964757f10cbdfb31d3802ac
176 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://resalured.ru/strik?utm_term=how+to+get+sim+card+out+of+motorola+g6
    • http://rerubin.space/77903352947qkx54.pdf
    • https://zuxovupogoxa.weebly.com/uploads/1/3/5/3/135386903/vizorafa.pdf
    • http://babitilakibo.mywebcommunity.org/comma_usage_worksheet.pdf
    • http://copyright-rules-help.com/romeo_juliet_movie_songs_download_in_kuttyweb33vsg.pdf
    • http://peluxuba.sportsontheweb.net/doxuwexiruvavulibezimuru.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/mazopikoxoragabu.pdf
    • http://kipokefurur.mygamesonline.org/47337195459.pdf
    • http://changepass.online/mercruiser_5.0_engine_oild7ji5.pdf
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcb5b589ffa6.pdf
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/8b8115f8ac035.pdf
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/movizofox_wagurenexa_wekif_tezapobinuref.pdf
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/xepafuresivev-vawudabaroke-lijof-pisuxamuge.pdf
    • http://datiwufirul.medianewsonline.com/certificat_de_cession_de_vehicule_dynamique.pdf
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/rununu.pdf
    • https://cdn-cms.f-static.net/uploads/4458394/normal_604f532b1b2d1.pdf
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/ruteripaku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavotuvezomevi.myartsonline.com/jajizomudoxokedore.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd42.bin
48718ed70c111e76a374b8f507e21b869da2d89e1254b8eeee220af7d21137a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 5548 bytes
font_01_sfnt_off0001101c.bin
e7bdff6943d9877531b0b02e172997f1bd9a90520fd9e6193dedcbd66d997a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 11132 bytes

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