Malicious PDF — malware analysis report

Static analysis result for SHA-256 4240dc8ef084a5c7…

MALICIOUS

PDF

85.4 KB Created: 2021-03-24 16:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58eb3e36a7fe1e3e539051bfc15810c4 SHA-1: 26a50b38664c42e587629f036310924af0ae8ccd SHA-256: 4240dc8ef084a5c7cdfa196c3f45dc664c34ccd1cb9247943c616388068f9485
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and it functions as a link farm. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the overall structure indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dugedepap.ru/strik?utm_term=how+to+replace+battery+in+kidde+smoke+alarm+i12020ca PDF link annotation
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/rajaxobosoje.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/zibominip.pdfIn PDF document text
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/8149924.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/which_university_is_best_for_electrical_engineering_in_usa.pdfIn PDF document text
    • http://tryici.xyz/intercontinental_hotels_group_annual_report_20190rbaq.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/3sicZOG/t-_mobile_scam_shield_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/hhdrdNF/20938286278.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxeje/jAjmhgj/avc_converter_free_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/OjjW8hj/54203081392.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/jhdfjjE/44208133319.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/ibhiGge/3230771467.pdfIn PDF document text
    • http://homearfes.com/jiwivawololubodaduahvn.pdfIn PDF document text
    • http://libralab.digital/pelpro_pp60_pellet_stove_reviews1vkqm.pdfIn PDF document text
    • http://gonalotuturopil.mywebcommunity.org/sequence_and_series_formulas.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/wcjhFhj/low_cost_flights_to_fly.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/1b4de02e-2e75-471f-9bad-d469b46c7661/bezuxuwud.pdfIn PDF document text
    • http://kexomun.myartsonline.com/biomes_of_southern_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e54e76-457b-4b8c-a802-2192092f5f65/49147406308.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/gefuwubavojumo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 5904 bytes
SHA-256: 93028d0e3168bb8bf6e65ebe8d85199bb9a8dc0571ae048ce9f6f6018ad98936
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 11724 bytes
SHA-256: 05ca7150a75cff7bc2aec801c2bc8c461a601bf2222915a37eb79b450ef92a1d
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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