Malicious PDF — malware analysis report

Static analysis result for SHA-256 9817da164b485584…

MALICIOUS

PDF

77.3 KB Created: 2021-03-14 22:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e1a860e7ed2e8b7cc8202de8af1df4a SHA-1: 61a62e6fb9bcb834770f370f12c697cacd247188 SHA-256: 9817da164b485584c5b58f866c22ce5ed13aaa07aeece218b7314a63400ba858
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=ikea+brusali+wardrobe+pdf PDF link annotation
    • https://cdn.sqhk.co/porekige/uhcZgev/fill_in_3d_game.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/meigvgi/free_music_ringtones_download_for_android.pdfIn PDF document text
    • http://xasumemazekejo.scienceontheweb.net/reading_fluency_chart_printable.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/zupuzotuvaxuk.pdfIn PDF document text
    • http://pewujok.mypressonline.com/dewalt_planer_dw735x_manual.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/nimetuzuvinadudude.pdfIn PDF document text
    • http://tojubilabesi.22web.org/how_a_land_grant_works.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/Fi5qhbj/wild_kratts_world_adventure_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/ijgd2jf/1051960350.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/mevojobokajepojujaxijuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_69ace7d6d45c4034908a4251010ddb58.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdffe32-8ed0-496a-8ba6-a3df9ebec874/sixazarobam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67414650-9360-4427-b498-4b6a1549cf53/nike_air_force_1_low_valentines_day_2005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b946658-a29a-4618-aadf-aae1892beead/xinokodurorizaserovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6a6ac9-a4f5-49fe-b2f3-d508f43ee0e2/what_is_the_spiritual_meaning_of_a_pink_rose.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_55c2ded29dfa453babd34cf24b371c5f.pdf?index=trueIn PDF document text
    • http://mivuturirem.rf.gd/kulikanavegew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45af5b0d-d110-422b-86a0-710c3e95e8bb/42280563841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb90b2f-061f-46bb-8fc7-6b7b4c995899/what_is_active_and_passive_voice_with_examples.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_59e15e72a83e4522bf1ac4761efcafc4.pdf?index=trueIn PDF document text
    • http://meduzifovum.epizy.com/measuring_up_science_level_e_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097e3995-bdd9-4b84-b4bc-956b02382758/xegen.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_385773140c4942b88135aa6054f62a17.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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 5268 bytes
SHA-256: 2a4e643d4f2d2f7d70436707819689f2e563c0d579796736be193b499c834d56
font_01_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 11312 bytes
SHA-256: bfd46e88806ad34933a653be3ddc469c6ee2b1f2bf35bc3c79ff00373b487c0a