Malicious PDF — malware analysis report

Static analysis result for SHA-256 377f2758d1cfd570…

MALICIOUS

PDF

93.6 KB Created: 2021-05-05 17:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 42454e22deb61fe518cddd1137c5f0a6 SHA-1: 74808a7f04e5169e484456455ed4e51d4439b843 SHA-256: 377f2758d1cfd5703865be997e4c76c48ee4407ea7c47abbf67d777de6ca74fd
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, indicating a large number of external links, one of which is a suspicious URL. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=silver+eyeshadow+blue+eyes PDF link annotation
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/zarumo-kunopewo-jokis.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/efa7228aaab.pdfIn PDF document text
    • https://daxosunusopudom.weebly.com/uploads/1/3/4/5/134510034/4602990.pdfIn PDF document text
    • https://lilalosemojuwo.weebly.com/uploads/1/3/0/8/130814601/1541686.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/topobopuwolabavi.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/jilekumivet.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/fezenur/ozymandias_poem_analysis_gcse_bbc_bitesize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1462f604-ab47-4267-8570-c00fe7d9ea01/zirozifokuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/12779926235.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/wopifuravikuxiludujelabaf.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_041477c345c6418ba8cbabbdb89254cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalomi/outlook_free_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/advanced_excel_2013_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88df775-140b-4254-8fd7-fc1ede4104b3/how_much_is_a_bus_ticket_from_nj_to_ny.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_9d10983ecb404043ab3b832423343c3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxegeza/75707209081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73078a9e-0e04-4666-b948-2bff78a0fc1d/21317572734.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/lopenelitawilopawab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85846d0d-3ace-4e92-aba5-39cb14a1bef0/nadigag.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/how_to_run_python_programs_on_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/lifodedavegi.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_8f89abb6119c40dbbe370463313467e0.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_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 5412 bytes
SHA-256: ee61191ffe7f2c2b4afc31b96e9c709fc2e42bf8a479e6c6fdfca1d58f835903
font_01_sfnt_off0001423b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423B 11156 bytes
SHA-256: 04f83d35f10c180f666c04a20f5196f4ca36a92693b26bce4c632d6cf6026bba

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