Malicious PDF — malware analysis report

Static analysis result for SHA-256 647bd0f4c4b7c5b0…

MALICIOUS

PDF

76.5 KB Created: 2021-04-11 18:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 75c535e3479c7f6f843666d463643f43 SHA-1: 69de2af0a351393aacd03c330719b16f4bb4fe9d SHA-256: 647bd0f4c4b7c5b00c9ee2dc968e13a603268021882f0df696a3d1cb550b4c25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a significant number of external links, identified as a PDF SEO link farm, pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier further support the malicious classification, indicating it likely serves as a distribution vector for malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=what+makes+parallel+lines PDF link annotation
    • http://jadaribod.mygamesonline.org/metro_map_barcelona.pdfIn PDF document text
    • https://xoxigukot.weebly.com/uploads/1/3/4/8/134861038/gulamuraraxod-sunijuwutidug-xosif-zuwavesusawe.pdfIn PDF document text
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/e2c05.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/c29ed9bb.pdfIn PDF document text
    • https://vikuwavek.weebly.com/uploads/1/3/4/5/134506456/159d1d.pdfIn PDF document text
    • http://posurazatux.mypressonline.com/mukep.pdfIn PDF document text
    • https://cdn.sqhk.co/duzefodaf/B4hciaz/flight_departures_tracker.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/qjehijc/plane_control_stick.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/ca431cdedf13ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/fortinet_firewall_300c_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/2010_lexus_rx_350_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/46403124474.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/22918531987.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/bosch_800_series_dishwasher_panel_ready.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/kidde_ionization_smoke_alarm_model_i9010_manual.pdfIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_e267188aa9984467ba7e1886220ceb2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxapoz/21270450412.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/20448473831.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/what_do_bad_blood_mean.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8c6ce2d69ae94f0da0240300b07c4db9.pdf?index=trueIn 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_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 5136 bytes
SHA-256: 9b8ad350ce47ee13ed1a0e1d70767c21f1aeea59e6cd1099be781e5155c68c88
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 11308 bytes
SHA-256: 4e03313cfd70aa613145ab34e639740636df715bc6a4022fdfc9eba455b916d7

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