Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40622d4e80c55b6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-08 12:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b28999d8d9a8a946614f5d98d7249938 SHA-1: 3e4092e7353e40d044ef990088941ed165466d79 SHA-256: b40622d4e80c55b6375a91054052ec7fec1a43c5a25a48cd65201a61273f6e95
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the overall structure point towards a phishing attempt disguised as a document resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=business+intelligence+and+business+analytics+pdf PDF link annotation
    • https://cdn.sqhk.co/vasinabew/gjbtIcR/tropico_5_review_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/g5jfv3P/metal_drum_kit_fl_studio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/VjdsFie/kugamegaribuferudewelixil.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/cnhaMge/disneyland_hotel_hong_kong_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/faserekino/hj9bAQJ/bingo_live_online_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/Dwifhb9/40242110444.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/RMijvjd/small_area_hockey_shooting_drills.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_d713a83bd6114fd4bc82652cd0d45c0a.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_bdae3f382f744880a19cec2df0ad0f84.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4b6acb4291e8446b9064709e27d1c90e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6e7ac4-4b66-4221-ae9f-ece92ad88c62/bunaziloloxusujasawabodi.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_b952c58cc6714c509ed30d071e94f977.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_e1788ef30b8c4f8da59f90555abf2b19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/484e327a-c366-44f6-9a92-7a125c9ab72c/yamaha_djx-iib_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c387750-2514-475e-9977-c93c4789b8ca/36829103434.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_092e3b7deda04ccea9bd09efe9c0efa1.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_e5446ef8e6f946fc987f4257a0a5a601.pdf?index=trueIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_0610f29ab0014c9896f8f0ff9c11f71f.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_ddaa3099d20149fe829c26857487a23f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca66703e-d558-43ed-8ca0-b0d80b585e41/rowedimoj.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_3217bc5bfbf547c59dba32120620ccd8.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_e93af0d16dca47048f8f18bf44dc6386.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_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 5520 bytes
SHA-256: ee06db43097167b7bac5f87f17a8555ca318ff646b1b7d106874b2849245e8b5
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10976 bytes
SHA-256: a8e6913c8d73b53235b961a081f6d55ce03be38305b82c900cba2a7d02ccdb48