Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f435d496179410…

MALICIOUS

PDF

80.3 KB Created: 2021-03-10 02:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8209009932b99f2cd77d13b24c6eda90 SHA-1: ae9f9a24c1332c7a651457736472200c7b371d86 SHA-256: 36f435d496179410df465b94d46c6a6f02aeb5669ec2d895384d86ccee388a27
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xezojetit.ru/123?utm_term=pak+army+song+video
    • https://cdn.sqhk.co/kifuzopeko/g3giKof/best_piano_keyboard_app_for_android_tablet.pdf
    • https://cdn.sqhk.co/kekotenonaxu/tN2Q0jg/jasanugi.pdf
    • https://cdn.sqhk.co/tirinakiweda/exjgVie/sisters_thai_menu_fairfax_va.pdf
    • https://cdn.sqhk.co/nitumatemi/ijgeggh/healthy_eating_tips_for_young_adults.pdf
    • https://cdn.sqhk.co/daxerarugak/MjggfbM/dunkin_donuts_charli_drink_ad.pdf
    • https://cdn.sqhk.co/mapetidul/gdvQwih/premier_star_soccer_league.pdf
    • https://cdn.sqhk.co/gazamara/WzicpaM/27339896064.pdf
    • https://cdn.sqhk.co/wadupaxi/g9geFhj/43948606219.pdf
    • https://cdn.sqhk.co/tekunipifob/UGhbzlY/jack_nicholson_bucket_list_movie_quotes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0e367525-36e7-4bb9-ba71-0d4b6b2def46/75216767683.pdf
    • https://uploads.strikinglycdn.com/files/c0d93559-9af7-4d6c-8a31-d10c967b3726/2004_chevrolet_malibu.pdf
    • https://uploads.strikinglycdn.com/files/4e00a021-a9c3-4fb6-9674-c316ebdbe8a5/60713879963.pdf
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_721a9ee59f274253a6b1a6c8ebbf8557.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76eca158-0412-4cd1-9fd4-73be194c4214/samsung_ua55tu8000wxxy_55_inch_4k_crystal_uhd_smart_tv.pdf
    • https://uploads.strikinglycdn.com/files/a679a51d-eade-4151-a849-a1fcfba18701/42847081926.pdf
    • https://uploads.strikinglycdn.com/files/7d45d277-b0f9-4b05-a0a6-e2e75ad7b188/20817152337.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_34280cd04b3247aaa8afc73a0d0a6181.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae1319d1-2b12-4501-818b-5b146394e712/magimifosatawakobamixiger.pdf
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_344307ec694c4405b8d82b9b6e3acd08.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0426323-b9c1-469a-8f81-4682d0b9b298/kowozowajutew.pdf
    • https://uploads.strikinglycdn.com/files/0f425690-3ca2-4ee2-a5cd-d9af7a441638/xulowavelefomito.pdf
    • https://uploads.strikinglycdn.com/files/8ebba7a5-56af-4b6e-9261-420a0e66eed8/chicco_nextfit_zip_max_vs_graco_4ever.pdf
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_77b5db4397084d09b7f0aa2346a4003e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/727a4d27-b1df-463d-bcc9-49152b66148d/donating_old_clothes_near_me.pdf
    • https://uploads.strikinglycdn.com/files/182871d3-dea3-4b19-ad1b-2855c94c2241/28317499579.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_744160b0199b4917aba4b355707a9929.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f027.bin
a9096a69ea922b3db2fd377fd4cba38aff5189750a3f67733e1baf7d4fcdd953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5048 bytes
font_01_sfnt_off0001013c.bin
23bd6f39b41e62c7da24d1a75267ecde2501b19bb7116683d1418e785e8e4b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10668 bytes
font_02_sfnt_off000125a1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 4324 bytes

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