Malicious PDF — malware analysis report

Static analysis result for SHA-256 765bd287e7c13941…

MALICIOUS

PDF

74.7 KB Created: 2021-03-09 14:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac55bcae35c0a21f0e4e6adabdc47073 SHA-1: ba354041c266114509d5c5a9d6c9c23bfc8fac4d SHA-256: 765bd287e7c13941357a3dfccc19cfcf1336b951de95d858b081b708c55804c3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically crafted to appear as a search result for a technical query. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, suggesting the document is part of a larger phishing or scam operation. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

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 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/strik?utm_term=how+to+set+swann+dvr+to+record+all+the+time PDF link annotation
    • http://vvinorama.fun/82434949117sokx0.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hUrOWwu/6818443850.pdfIn PDF document text
    • http://cethq.xyz/what_is_unique_about_sydney_australia_area_codevtmc1.pdfIn PDF document text
    • http://buylettersonline.com/34006357351k8sek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fd05ef0dd9e3.pdfIn PDF document text
    • http://shtancircul.site/new_movies_2018_bollywood_mp4moviez4npn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_6039ae8719a26.pdfIn PDF document text
    • http://hydra.moscow/dnd_5e_epic_levelsw8r3u.pdfIn PDF document text
    • http://tebifujokejub.22web.org/why_does_my_lg_dryer_keep_blowing_the_thermal_fuse.pdfIn PDF document text
    • http://dayzcommunity.info/dametk7s6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_601253d49b7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6016f701cdfff.pdfIn PDF document text
    • http://sodalabs.pro/mammogram_guidelines_2019_uspstfo2xwx.pdfIn PDF document text
    • http://giviwopifa.22web.org/jegoraforamoxir.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/Njbjbie/heroes_mobile_world_war_z_hack_version.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/6ahAgjv/canvas_student_view_rubric.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfacef7-729e-4537-ba46-e748b601f5d4/singapore_math_workbook_grade_4.pdfIn PDF document text
    • http://susupufewowe.epizy.com/11722377183.pdfIn PDF document text
    • http://rexalovujomorox.epizy.com/jim_collins_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc3e2fe-124e-4436-aaa6-85c9abc7358d/pandoras_box_book_series.pdfIn PDF document text
    • http://kugefosames.rf.gd/95400422803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfb714d-9454-47f6-8f7c-18ee9ff9e353/artillery_shell_casing_identification.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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 5292 bytes
SHA-256: c4bcc6f3057dc5098479f503163db0bb1c4c63f359e954ee5a83585e57f773b5
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10500 bytes
SHA-256: b5403f9ab9b23c2463b6cd1acc1fcf84d0f8650aae0e939b80a5e4674a497498

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