Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ef39883fcba4ea…

MALICIOUS

PDF

74.4 KB Created: 2021-02-12 01:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8a505d2182bfa59da0b5fcdc0e0a743 SHA-1: 8b8d6ea70cce42ef419cd4a9d35363d56bdb6063 SHA-256: 79ef39883fcba4ea7b26a2fba1392114337912ff4d6f68952c1681aa0eece958
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs are likely used to redirect users to malicious sites for phishing or malware distribution.

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://druttle.ru/wix?keyword=rock+cycle+worksheet+answers+key PDF link annotation
    • https://cdn.sqhk.co/wovegase/Uo8w1aG/xadasilipomituk.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/bo07gfr/stick_of_titan_2_mod_apk.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/napodib.pdfIn PDF document text
    • http://cyberlife.store/magazine_mockup_psd_freenqjba.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/ie70jfO/fimovikuvadu.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/wujevuviruzovaj.pdfIn PDF document text
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/2980123.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/cyEeYmD/watch_nfl_draft_live_streaming_free.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/ziniletazazifaxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dijobika/Migdmja/linearx_leap_5_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hf9Dgf3/fanulilotenomirav.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/iDRNgi2/best_buy_canada_black_friday_2020_flyer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojiseb.epizy.com/uniforme_de_cardenales_de_san_luis.pdfIn PDF document text
    • http://lixutepojux.rf.gd/dekizata.pdfIn PDF document text
    • http://kudogal.rf.gd/nipulaloxodibesomolev.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/xuxajelax.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/ninezibesisurowaxex.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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 5152 bytes
SHA-256: f4875a61292c921bfb33cfc32f64bd933f2e83374b1dbd7c9d8593852c816837
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 10396 bytes
SHA-256: 969a52167a1aeb522f5facb96978e544f155b41311fa638fb7e1c4a8b214ec7f

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