Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3584a9990089f0…

MALICIOUS

PDF

78.9 KB Created: 2021-02-27 19:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b312a0b79f9548f86571356a44e8995e SHA-1: 747a27ffa0d14da673cc9f18cf51621ac1aa1193 SHA-256: 7d3584a9990089f0bd439ffe3db3a976fb8eff1a4f81e6e1e7d33e5b7ba23193
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate a likely phishing or SEO spam campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=the+magician+tarot+love+situation
    • https://cdn.sqhk.co/metexemoraga/Stpibgi/sobelomipokogomus.pdf
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/gumake_miwudun_getixoji_folefutivome.pdf
    • https://cdn.sqhk.co/zoturisa/rj9ihcy/ball_bounce_and_sport_dallas_tx.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/6cd12.pdf
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/didaje.pdf
    • https://cdn.sqhk.co/merabuvi/zij95X9/century_arms_vska_problems.pdf
    • http://vumonivaxozutod.mypressonline.com/nujamuzazuxubegexojup.pdf
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/puxako-nesitarajeditub-bifudasodadiva.pdf
    • https://cdn.sqhk.co/xazururoxe/jaKAXd8/60828173653.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_601f6c2c65d42.pdf
    • http://dalidusiz.mywebcommunity.org/7277882362.pdf
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/01a6cf79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://liraperuwuw.atwebpages.com/desapunejelovofiketesin.pdf
    • https://s3.amazonaws.com/bipepezuwed/dumosulumuwibolebod.pdf
    • http://vugejepu.epizy.com/el_principito_pelicula_1974_descargar.pdf
    • https://s3.amazonaws.com/batoragubukepo/crosman_1077_wood_stock_uk.pdf
    • http://pikaderobiw.atwebpages.com/how_high_should_i_put_a_carbon_monoxide_detector.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_off0000eab7.bin
d032fd42a6f26469cd285102bdcc65f4b9dd7bf1726d4276faf6171417b54f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5104 bytes
font_01_sfnt_off0000fbf2.bin
e29226c7933216f8f3c1ac2ef00319cb02626c0080c11a03210ba995df2002dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10692 bytes
font_02_sfnt_off00012080.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 4324 bytes

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