Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c66b91a1c95363e…

MALICIOUS

PDF

74.1 KB Created: 2021-05-07 05:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fa018005ddb8a129756b1f4c09a2c887 SHA-1: 5ccd03662522ae69a29785e5867535eb4cedc35c SHA-256: 9c66b91a1c95363e7e3db73295f0a31b1f5e41857978bc83ea03b1dc5c4a036d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard use of PDF for SEO manipulation or redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=rmv+driver%2527s+ed+manual PDF link annotation
    • https://cdn.sqhk.co/gofelaxes/jaidjaQ/reuters_news_wire_service.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/google_maps_javascript_api_v3_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/fobevufesupi/ibFtiaI/jerajumivomukim.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/allahabad_high_court_aro_answer_key_officialuv4gn.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/dopikigete.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/jinUhja/sufinonesonomilufex.pdfIn PDF document text
    • http://alex-travel.moscow/business_vocabulary_in_use_elementary_to_pre-intermediate_with_answers6czq8.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/undp_sdgs.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/what_does_a_large_sweet_potato_look_like.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/miciggd/kumamogewabowafasizurig.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/9538763edb49.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/ifijDW7/vba_excel_macro_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_dffa366ebe0d4110b81a43706a7a9125.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/72533284670.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/airman_information_manual_2018.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/gubolavikeruxaxazifojari.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_87aa17346f714acea2af426eef8d7896.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_7bdb873a353842a0961720fb1bdb7e55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/fanny_build_guide_mobile_legends.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/gikavid.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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 5072 bytes
SHA-256: 02faaede1ee2acbefe7410d2d4719d3f27147704ebae4c6533f87b61139cd1f8
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 11548 bytes
SHA-256: 8a2f8425cc07bc7281942c312c87ec9331aa151cd1b994a5c4084c0704c376e8

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