Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7e1be886019c33…

MALICIOUS

PDF

69.2 KB Created: 2021-04-22 20:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f118a0a0904feb8d2cbab9a603773351 SHA-1: d8803d484d2ad0d99639874802885eac23226fb8 SHA-256: bf7e1be886019c338da1668f4c2463f7e816af8ea47b8061226f6dc21ac24fbe
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document presents itself as a 'Daily language review grade 4 answer key pdf' to deceive users. It contains numerous external URIs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=daily+language+review+grade+4+answer+key+pdf PDF link annotation
    • http://hamsterbig.com/how_to_choose_butter_lettuceb0o8b.pdfIn PDF document text
    • http://chelamela.org/fancybox_package_latex2bk8g.pdfIn PDF document text
    • http://proita.fun/rakuxonedobofogudut7fyd.pdfIn PDF document text
    • http://sutudokigedi.22web.org/1785421733.pdfIn PDF document text
    • http://idealica-uficiale.website/5081484078cj20c.pdfIn PDF document text
    • http://filanion.online/powerpoint_slideshow_template_free3he93.pdfIn PDF document text
    • http://itverys.space/gelawinidalaxumujawajuj3uuv.pdfIn PDF document text
    • http://freshmind.net/pet_rock_inventortms9r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c93e3e17-565c-496b-95a0-45fea83b015f.filesusr.com/ugd/cd9bb8_27a61dc245044a60b577e73941e09702.pdf?index=trueIn PDF document text
    • http://tizelimanux.rf.gd/42519033933.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/cadette_book_artist_badge_requirements.pdfIn PDF document text
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_fe12ff54dee14f009b6a3d4fb943451c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/financial_hardship_letter_to_creditors_template.pdfIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_f57169474d044c5085024fb964b162de.pdf?index=trueIn PDF document text
    • http://moliposapivar.epizy.com/3dp_chip_portable.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_f6151623f40046d1b02ffae9bc2599bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/44138711407.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/52895244791.pdfIn PDF document text
    • http://gakuxalodakedaj.epizy.com/56147703503.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_81174b08e95d48f484369b0d2eb40a1b.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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 5612 bytes
SHA-256: 78092b4c6ea1c495221d9c1a496e4dc01096fb4579e79c20812779e932d15e44
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10264 bytes
SHA-256: b714a8b32c4e71ab06943b18bc670c2cb86bda31d8e175a58e704fe48b79de3e

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