Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba43fefceac112e6…

MALICIOUS

PDF

77.8 KB Created: 2021-05-08 20:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b3616a59eb7527b67f2deb6866eb0e3d SHA-1: 9241f59f886d403891bc9700456e8f13033166c3 SHA-256: ba43fefceac112e6f33ae94fcba8d117b84fb744c4192c72d8780f90ffb5df1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as phishing and trojan activity. The document body, though partially corrupted, suggests a lure related to creating a resume for free, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=crear+hoja+de+vida+gratis PDF link annotation
    • http://stopro.store/48928475764svy2o.pdfIn PDF document text
    • http://believes.space/703576868446qkgp.pdfIn PDF document text
    • http://optamorem.com/364746299355rpi5.pdfIn PDF document text
    • http://dobubagex.iblogger.org/jofed.pdfIn PDF document text
    • http://fasadi.site/19780405204jac0.pdfIn PDF document text
    • http://nibelv.xyz/gexatuyvsxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_d621b9f9650041fb91bcee40f3879148.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_f9c3f49c3acc4a22b1b9d06f5da77e19.pdf?index=trueIn PDF document text
    • http://sobibuxasegisun.rf.gd/a_lesson_before_dying_chapter_1.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_04ed652a1b7d4fea838ff7486daefa2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jawusawar/product_rule_for_radicals_worksheet.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_6a67e0dd76e04c8e9e1af1ac8b5aab7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxexi/lasabubivebixoxerunavifex.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/avast_internet_security_with_license_file.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/how_to_read_stock_index_futures.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/what_is_the_point_of_view_of_a_streetcar_named_desire.pdfIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_847993c69d6844f0b34ade06887aa5c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/ba_1st_year_all_book.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/bernard_maris_livre.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/nelovuxagepexamazi.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/how_to_clean_cuisinart_electric_pressure_cooker_lid.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_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5096 bytes
SHA-256: 0b75fb50d68dc75682be488e0a462a0a5943ce60eef2d75bfbd2e0a8ee56cafa
font_01_sfnt_off0001030f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 11528 bytes
SHA-256: 2e9297124289b8b928009ef9fbe271ee8045ca7dd0b3bea4d483da445cfd7e3b

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