Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5fb5ef732d8f75…

MALICIOUS

PDF

85.1 KB Created: 2021-05-09 16:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e87c2da8e45603a8f53b6dcebcbf03c7 SHA-1: d2c284fa0f5815b6b77ce8dd669e397c7be76f99 SHA-256: 7f5fb5ef732d8f7591de9c97dd33bd5e6f405fde6e52cba03afb05fff2a0014f
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to a clinical diagnosis, suggesting a phishing lure. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=diagnostico+clinico+de+trombosis+venosa+profunda PDF link annotation
    • http://tulomodev.getenjoyment.net/how_to_adjust_noise_cancelling_on_beats_studio_3.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/assembling_and_disassembling_of_cpu_steps.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/xenokigifelupe.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/jujufepemizijojuroja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_3fe828ff1cfe4e7493699d9ca00cf09d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/cisco_ise_windows_certificate_template.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_69c5ac1738324daeb9ce2af55409ff1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/what_does_the_mockingjay_pin_represent_in_the_hunger_games.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_7ecb7f5920644438be6942294ea2a401.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_32f6c8eb814049e18d074c4a64a9228b.pdf?index=trueIn PDF document text
    • https://38c64f87-0506-4925-a3a1-425743e24937.filesusr.com/ugd/386d45_01c146a95e124b69a3b1e5ca2d928232.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/what_is_the_setting_of_the_story_peter_pan.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/14645385566.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_6a8adf1178a64495b4a6fe53ef81d209.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/el_principito_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/gevapiri.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/72545072119.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/karoxeturik.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 5676 bytes
SHA-256: 69acebbce3ae4fb46049b0f10f0af7fd7b0ea69e5527e906ca7b9b7144b7f047
font_01_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 12016 bytes
SHA-256: cf0cb065913da21a8aa228329367081049a427ced1f28b5faedbc4d33ac611d6

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