Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eb77c8aee63a7c…

MALICIOUS

PDF

81.7 KB Created: 2021-03-15 22:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f025c881451c1f2170081b7ee3039af8 SHA-1: b1a3077969715c097c0bc42ab6dade9334cfd8bb SHA-256: 49eb77c8aee63a7c9d046f5c67a6dc074eed0fa509db17b060541cf8bef1b2d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://bologen.ru/strik?utm_term=remington+chainsaw+service PDF link annotation
    • https://cdn.sqhk.co/desiruzag/dgeyMgf/wolfcraft_circular_saw_guide_rail_system.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/h8rz8ja/fist_of_fury_cast_then_and_now.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/jh5eghh/73023870678.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/ajgjfjc/nick_s_bar_and_grill_rowlett.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/jbDgfYB/felitovom.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/jcJggjv/wikipedia_donation_2020_is_it_real.pdfIn PDF document text
    • https://cdn.sqhk.co/motakolilo/Whg2yjj/arena_stage_theatre_washington_dc.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/2Ghj4hd/download_war._io_tanks_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_171e984de720410b9739265fceb21084.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0e0e6aa1264d4f21b9c8ec91314e479e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a28e89-3d12-4a85-be30-c63a9079bd4b/lofthouse_whitewash_brick_effect_tiles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5371ec-2b98-4a97-86d5-bf1eacd29fd6/baumgartner_and_jones_1993_punctuated_equilibrium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8e5049-53b6-4713-8ed9-32a4eb6d3723/87873196965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d386baa-c458-4331-9462-a1ab5d82aa7e/wopisivifazuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1d117f-43ed-478f-8cca-6c13f3f38a9e/biluxo.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_f4ac824c355744f484174e3646c9ffe3.pdf?index=trueIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_b353a7a964e44eada5475b61417bb07e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2396dc-1490-4992-857e-80b4119ce97e/fender_twin_reverb_speaker_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788e5b98-3072-47e0-9558-32c913d1c0bb/44909824988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef10d21c-daba-4820-85e6-9c274adcf290/how_to_become_trx_certified.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_d5c9fd3dbba04e0ab8c3ac8878f32da3.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_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 5340 bytes
SHA-256: 3af7e8c440c64c4d1ddbe1c61fe73cec8da73432b39bdc3267f98dabcb7b64b4
font_01_sfnt_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 11412 bytes
SHA-256: 37718d43ab8839669bec54196a6a4f2206da0a08a436b4d3a7cefee6dc361dcf

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