Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2be88c71ef84a8b…

MALICIOUS

PDF

81.5 KB Created: 2021-03-29 16:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 33db28b8a5444e0107ccf98815c2e389 SHA-1: 03a98079419e31ab7723d98d6622de2dde3c4274 SHA-256: f2be88c71ef84a8bed773c71c610c960a3ce4316c707c51720c8a8df5d080323
226 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. While no scripts were extracted, the presence of numerous external links and the lure heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/award?keyword=scantron+forms+pdf PDF link annotation
    • http://samozanyat.info/13159286006s2y5h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_60024419cc280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_5fe73663e787e.pdfIn PDF document text
    • http://gazzsheff.xyz/954979860945583h.pdfIn PDF document text
    • http://prizinsta24.online/tuwonodoboduknrg5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fe660129fec5.pdfIn PDF document text
    • http://apparently-home.com/how_to_speak_english_fluently_app_downloadi5sid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_604d121bbc1a8.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/95151041101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc906adcdc24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a50a70ac-c888-483e-afce-8dc8012d9eee/how_much_to_repair_apple_computer_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8b8e34-7497-4199-a3a7-c3cd6079e54b/zuxeborunopuvezesunije.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_c8331b5437464099b86a9ea08a184c24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7894cf51-ff0b-494f-a098-2df9def3c311/nuxuxeseze.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_8ca18078046e47eba1bdbd21e63169e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd608dc9-ebf3-4e8e-a31e-5b7cd313d5b8/john_deere_455g_crawler_loader_specs.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_b735441a6edd454d8214ddf6eb76b938.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39151494-7089-46c5-a324-732f08afde3b/zupukerifopoleraka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7022e17-10ca-489c-a495-0cbdcee67aa8/bengali_to_english_dictionary_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1406d195-5ce1-4f96-8ebb-d997ae28507c/1994_s10_brake_light_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6dc0fd5-13dc-445c-9bb7-6d63812f2da7/19289369018.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/11623452436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 4996 bytes
SHA-256: 85e43772d485fba4661816f552378bcaa5034a7d87d5ca3a9087096e7eb3b5b6
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11692 bytes
SHA-256: 5306bda4199ce206f43a956a7f870e991eb73ff011df5612982d2e852873b214
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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