Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f782b44a1fd886…

MALICIOUS

PDF

76.4 KB Created: 2020-12-11 00:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c927dad4192915206380cdf525e67110 SHA-1: 660e549f7b0e6b805027dd9ea89de67eaa1ba029 SHA-256: 88f782b44a1fd886b9403da8185a93b6f018c8ad76d2376991099e1ee30a2232
214 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including a critical finding that it links to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links, despite appearing to be academic resources, are part of a link farm designed to redirect users to potentially harmful sites, as evidenced by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=gee+2005+discourse+analysis In PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/6165724.pdfIn PDF document text
    • https://sigozebuxofiko.weebly.com/uploads/1/3/4/3/134372047/josoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8d4d5ee099f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4cd580a2757459bfbf001/t/5fc51aa13c6ccf69f3014fd9/1606752929086/function_notation_worksheet_answers_algebra_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b9942e537a05ef14dfe3/t/5fcab6a29f1ed260783dc41b/1607120546414/52470769041.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28fecc30a162e0c5d0be7/t/5fc3a3e7fa04221c718f6aea/1606656999761/35757497972.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ce31d26ff1194f9586a7/t/5fcb77c5393ce4735633c79f/1607170000051/business_games_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/11087738722.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdfecd190b057dd37d964f/t/5fd0b66da9460057588457d7/1607513710246/26881730395.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6463427a199023ad9da39/t/5fc88c5292e74531f3ceb262/1606978643372/774903186.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5510aa13a450bab11af48/t/5fd19358ce71ee580fa52ef8/1607570265162/dragon_ball_super_wallpaper_4k_iphone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c550bf71053ccb3114cc/t/5fce4e37978da30c562cb52c/1607355960437/ninja_air_fryer_oven_walmart.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dc7ae9fc3622d53b5433/t/5fcc6273662d5e24e0995581/1607230070662/zapiwasidalale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0bcfb2e537a05ef083615/t/5fca1176e262c0159468e96f/1607078263244/mijn_simyo_opzeggen.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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 5464 bytes
SHA-256: fa89721573b7e6df052115041e81831a3ec8a5cb41c70b66185dc294ec696bd6
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10372 bytes
SHA-256: c988403075c2e430ea6146b6fd8474a09f1ac3fc3bb4ee7d352f98ce1b6241cc

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