Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e483a31ce93c2…

MALICIOUS

PDF

71.5 KB Created: 2021-04-25 11:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 25192e3d2a135e75c41fa67ae0f1782f SHA-1: 56997fd667c1a1e88d89a42df2218c601873f80b SHA-256: 169e483a31ce93c2d4fa300006ec5b718d337fc457d32382ed05cf524d08093c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=esv+study+bible+large+print+hardcover PDF link annotation
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/gegumeru-nakixe-fowimuwi.pdfIn PDF document text
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/fetanojap_xomatupokepa_vatijabedawewa_fuzodasun.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/agile_estimating_and_planning_by_mike_cohn_download.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/favalaw-vabemajokazab-giviwed.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/nujatatebesavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokepomi.onlinewebshop.net/algebra_solving_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/nfl_preseason_power_rankings_bleacher_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/how_to_program_zones_on_dsc_1832.pdfIn PDF document text
    • http://kizufalugomux.atwebpages.com/encyclopdie_larousse_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/68919367860.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/scag_tiger_cat_weight.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/94857703276.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/78374904678.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/31413310964.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_95de9fb5061a4b7d9076e791c9ed1b15.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_5e4bdb1af6ea4469a8229ffe61ca20ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be849ab0-0ca4-48d9-a966-500a4460f1df/56658453130.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/karrimor_mens_size_guide.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_1deb95ead10b4471adab64b6c9088442.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95999210-6ca8-4667-a951-232b3c884192/purebesivanaligud.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/mental_health_issues_in_college_students.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/how_do_i_connect_my_gaming_chair_to_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4069a937-0e17-4b8a-a5cd-77781f1dc5b6/immortal_in_death_paperback.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/68396575757.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 5596 bytes
SHA-256: 825d7467038d4df38ade213628db7c96af738acfd86e8ad5b4e7b686b52ada8a
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 10500 bytes
SHA-256: e994f3b330c418f36b8974b40acaf7ac405463edc3a3c4604d1d86900acb5ee0

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