Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5d35d5365f5fbd…

MALICIOUS

PDF

67.4 KB Created: 2021-04-02 15:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac2aad4d24259dac8681cb7fde896f60 SHA-1: 5c73d65f8c3528161d82c6c52f712237281b3955 SHA-256: fe5d35d5365f5fbd2daba57554547500eb0cefb4d7b2c6562d77b7de8af03994
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to domains associated with link farms or SEO manipulation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to direct users to malicious or deceptive websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=letter+to+my+ex+chris+sails
    • https://cdn.sqhk.co/jegamaxegev/3Ljfxnd/93333848805.pdf
    • http://nekazupafo.mygamesonline.org/75755381763.pdf
    • https://cdn-cms.f-static.net/uploads/4446379/normal_600d9d512c9ac.pdf
    • https://fulopovesaj.weebly.com/uploads/1/3/0/7/130740112/luzuxejulagapa.pdf
    • http://sutovuresas.mygamesonline.org/pozal.pdf
    • https://cdn.sqhk.co/timemowab/inqYwha/14476228022.pdf
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/jopur.pdf
    • https://cdn.sqhk.co/favejofu/sx7geNp/cars_for_sale_under_3000_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4458623/normal_604473ae99f55.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/vuwaxivumuk.pdf
    • https://cdn.sqhk.co/fojevimexu/hhYuibz/47787034078.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6049f035a165d.pdf
    • http://gaxenop.medianewsonline.com/autonomic_computing_download.pdf
    • http://lufijep.iblogger.org/nikidokosedikijidalesi.pdf
    • https://cdn.sqhk.co/bepifopid/jd2ZCid/lyrical_dance_moves_with_pictures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9b6871f7-0cab-4a47-93f5-421a35711f5e/sears_diehard_gold_battery_charger_manual.pdf
    • https://uploads.strikinglycdn.com/files/e4e36e22-c854-4388-820c-51acddd10aea/62138027036.pdf
    • https://uploads.strikinglycdn.com/files/a1dc971b-c3ca-4e4b-9e34-6fbd778019fb/microsoft_excel_2013_free_download_without_product_key.pdf
    • https://uploads.strikinglycdn.com/files/ab3c0f73-6550-4284-8bc6-4285703a7833/venn_diagram_equation_solver.pdf
    • http://defefefesid.rf.gd/basics_of_computer_software.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc47.bin
312ba4289b49fe699af659992e43dd923f01b68b0cbfe165c7e7cb3d39da1f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 5148 bytes
font_01_sfnt_off0000ddac.bin
25716ca5b3bab21ff979c91983831e2bbe6e87942be8c19e1c420631c67d5eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 10180 bytes

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