Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92ec92b56efca5c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-25 14:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d182fa17be71295402c0bf01b8c10c17 SHA-1: 8d7ce938331340b5a317252c474a3272b9dd0147 SHA-256: f92ec92b56efca5c4a2145e606b9b7c7fde18ee9937eaff823b84a13a3a9d4ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wb?keyword=how%20to%20use%20whirlpool%20accubake%20oven PDF link annotation
    • https://zunijitulizi.weebly.com/uploads/1/3/5/3/135305500/dugef.pdfIn PDF document text
    • http://flowerport.store/sephora_face_sheet_maskhk60d.pdfIn PDF document text
    • http://lp-consalt.ru/coby_mp620-4g_bluetooth_headphonesqlye4.pdfIn PDF document text
    • https://cdn.sqhk.co/vujalenan/9hghiwH/5956910257.pdfIn PDF document text
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/5943823.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/sagajotanesavesez.pdfIn PDF document text
    • http://allieshouseofhope.com/crazy_taxi_unblocked_games_66q90rd.pdfIn PDF document text
    • http://remont-pc.website/45446529892cwuno.pdfIn PDF document text
    • http://50offshop.pro/how_to_use_clean_cycle_on_mr_coffee_coffee_makerg6egk.pdfIn PDF document text
    • https://sawagifavemon.weebly.com/uploads/1/3/0/7/130775832/ravogafivodu.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/tisuwunukokewujo.pdfIn PDF document text
    • https://rajuputodetu.weebly.com/uploads/1/3/4/6/134682309/motobowusasosab.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/78890918.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/Cif4dRt/second_hand_clothes_suppliers_in_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/hsBunie/mugotupidibagutegeraxum.pdfIn PDF document text
    • https://mituzeru.weebly.com/uploads/1/3/2/6/132681412/5484810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitizobuv/lijedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f275ad-5252-4a86-8b9c-222c5bc549a2/why_is_logos_important_in_an_argument.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/ddo_favored_soul_healer_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc10298-e427-4727-b8fe-8e95b32e7249/the_raven_remastered_gameplay_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/83171227466.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 5220 bytes
SHA-256: 2137e2a5e64930aa3d192c6c00c25b84dba7b7fd4f9198284cb3247ad2d58343
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 10796 bytes
SHA-256: 062f4351ac273a020c80ba60c1808ec613991d2e2bd440465a7c9c68e1115635
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361