Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39437c8154d59bc…

MALICIOUS

PDF

73.2 KB Created: 2021-06-01 15:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43a6bb1cc70a62a406288f17f7447f5b SHA-1: 796558a654da4e781bb8cb3cad1676fc83d6c0d3 SHA-256: d39437c8154d59bcdbc6eb9616d98561889029b74ed76503ccb454ef7163528f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious content. The primary URL, 'https://krisoc.ru/pbw?utm_term=adobe+audition+cs6+free+download+with+crack', indicates a phishing lure for software downloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious sites, aligning with phishing and potentially drive-by download tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://krisoc.ru/pbw?utm_term=adobe+audition+cs6+free+download+with+crack PDF link annotation
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/rowatomi.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/ruxijoxomimovan.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/585086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80216d95-56c0-4ff1-a58a-c5491f2acbb7/16044741125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6569b67c-f266-4fad-abcc-ba24f499bfaa/34634553531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd9bdac-b491-410c-bf61-a5cb997fba69/romam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c100b1a2-756a-4204-a89f-d0d1b2dce2b4/88631840699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7242284f-8ab4-4b0f-93a9-3c42d195173c/33941692666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6686db-1dcc-4e8a-b63c-17ae8c0c2c59/sentry_safe_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b271c5-8e6f-4ff6-ab6b-6a0610735f78/jinomin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350fbf18-b709-4b05-af5e-db19fdaebb76/the_girl_king_full_movie_eng_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b56f691-5e5f-47fc-a435-a1a2cb983204/sankata_nasana_ganesha_stotram_telugu_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49515220-9a43-4957-85fa-31b356c91a79/zaxexuvatosemebov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6b7177-05f1-4aac-82b6-0637c8204f0a/an_electrochemical_cell_oxidation_takes_place_at.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a9937b-d2f3-4056-990c-9f32396051e3/peavey_vypyr_vip_1_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024096f7-97ea-4243-bbf0-9f61657f1b2d/wonder_r_j_palacio_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7defc3-3f17-4d30-b7dd-70db6c1eabd0/geometry_chapter_11.2_justifying_similar_triangles_worksheet_6_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e39bab4-f96e-4901-a6c4-95095c01b0a7/rujesorun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad9e616-0f90-423b-a343-3065dcb758a3/kill_team_basic_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef855519-169a-43bf-9e46-512b0cf11743/demukema.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5548 bytes
SHA-256: 4dba747f4465454c719871d90b3b64e477445e0e37b1ef1a44de4a5a5d7544f2
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 10496 bytes
SHA-256: 40ceaead1d5fcbf17f7e21aa116cc8d940e35036e78a0b7e925db9e6b3a81785