Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62c4ad12f13de78…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 22:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2a131289749ea42ce2da285e784013 SHA-1: adcfdba50d42f1af47dfc78e2b3f8c6ea0bcf162 SHA-256: d62c4ad12f13de78b43113aac201a773b4c0fefc038584e7d006edefa304c0c1
156 Risk Score

Malware Insights

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

The file was detected as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=raft+wars+3+hacked+unblocked
    • http://kujinatazema.sportsontheweb.net/givaxop.pdf
    • https://cdn-cms.f-static.net/uploads/4421215/normal_6046f487c923b.pdf
    • http://marketop.club/odia_dhoka_video_song21knk.pdf
    • http://insta-sale.site/nodititodpfywp.pdf
    • http://sevowina.medianewsonline.com/loduwadixup.pdf
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fe4afaa1ce93.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd30711cad9f.pdf
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdf
    • http://on-arenas.com/psychology_in_your_life_2nd_edition_citation6aw7a.pdf
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/4a7963914c316d.pdf
    • http://claire-irk.ru/pokemon_red_walkthroughe1pic.pdf
    • https://satewode.weebly.com/uploads/1/3/1/4/131407014/7047502.pdf
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/letugufanux_nurovusilerizix_laluvijugovovi_gikufedimu.pdf
    • https://jukewamozaf.weebly.com/uploads/1/3/1/4/131438013/d62316e8.pdf
    • http://sipipewawezizuf.getenjoyment.net/nolalipanaxufujalukovegi.pdf
    • https://cdn.sqhk.co/mixenezir/ijib1QR/75908316944.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_3402770ad5254738a9039dd2ae6e5e99.pdf?index=true
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_5c925c1728cc4d67be3fcff9d3abac5a.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_7963791b9461459d89090da040bc2869.pdf?index=true
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_36d068cb8cec431492952f8ce86433b1.pdf?index=true
    • 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_off0000f311.bin
9eb8c2d9c6352db4699b4f30b01c75ce45fe38dbdbfa0807b09ce2096969c692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5576 bytes
font_01_sfnt_off0001061b.bin
95887eb4ab93c408073ce065ab318009b65e011def199345c8baf625b5bf8516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 11148 bytes

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