Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe712b28751de9de…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 13:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817e54e11873890c35106fa49d716053 SHA-1: 26f7b49b0c3f06d5c9f8cb4f2d9ac7b716963cf4 SHA-256: fe712b28751de9de516755b54f0ecf0affd3a21c005bc16ebe54373bf3eabaca
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with a primary suspicious URL being https://nipisod.ru/wix?keyword=red+queen+pdf+free, suggesting a lure for users to download content. The PDF structure and embedded links point towards a link farm used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/wix?keyword=red+queen+pdf+free
    • http://mesanezedid.mypressonline.com/dixusumi.pdf
    • https://static.s123-cdn-static.com/uploads/4482405/normal_5fee28d210c98.pdf
    • https://static.s123-cdn-static.com/uploads/4426815/normal_6005cd03dcb7c.pdf
    • http://tokepefanoxite.22web.org/how_to_shoot_from_a_deer_stand.pdf
    • http://kimujedat.mygamesonline.org/tecnologia_farmaceutica_definicion.pdf
    • http://dovoxijego.iblogger.org/slick_rick_hey_young_world.pdf
    • http://nadefememidep.medianewsonline.com/44558371385.pdf
    • http://dololebajug.scienceontheweb.net/rolozazaxi.pdf
    • http://rivilidopu.medianewsonline.com/nodafasafexazusunokebot.pdf
    • http://goxamid.mypressonline.com/convert_to_word_arabic_and_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/939460c0-b5d9-4427-9b20-92d18ced7e0f/the_walking_dead_comic_online_espaol_190.pdf
    • https://s3.amazonaws.com/suxiweke/5476088121.pdf
    • https://uploads.strikinglycdn.com/files/bb3e50fe-d2d3-4804-ad8e-331c459bfe9e/4320406181.pdf
    • https://uploads.strikinglycdn.com/files/e8b722b4-0200-4efe-bd31-556feaeaa359/xanituk.pdf
    • http://funuduki.rf.gd/batch_manufacturing_record_template.pdf
    • https://uploads.strikinglycdn.com/files/a6b380c3-1532-40fa-b1e5-6951aef0dca1/how_to_use_alpha_vantage_api_in_excel.pdf
    • http://kojorelivav.rf.gd/homelite_weed_trimmer_gas.pdf
    • https://uploads.strikinglycdn.com/files/4d95fba2-edd9-4d66-a476-7cf8b3d21b5d/febuzowawofib.pdf
    • https://s3.amazonaws.com/niporofez/tudikupavilejas.pdf
    • http://xekivigevu.rf.gd/los_angeles_transit_map.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/police_report_template_free.pdf
    • http://rewuwuja.onlinewebshop.net/can_i_cancel_my_planet_fitness_membership_because_of_covid-19.pdf
    • https://s3.amazonaws.com/degisapemifa/61635780448.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_off0000eda7.bin
2ba01fbffa9beeec27b1ef0ab92af85627d9df6b37e87fe9b4b3bade4226280a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 4748 bytes
font_01_sfnt_off0000fddf.bin
cff218ca0850c5ba89e4ce9fc647721d9134c1ff560d860c536dc1a1b24c2045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 10796 bytes

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