Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b6463ebca32b1e…

MALICIOUS

PDF

120.0 KB Created: 2021-04-03 07:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ac8f0272eab559da5d09bb672e2ebce SHA-1: 24f6c625a1944becf66c928cfd9d97219f04e9ce SHA-256: 99b6463ebca32b1e58d8f7ace98d0c988bddce76cf46caa4df40170b0fe5df6c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=groundwater+contamination+pdf In PDF document text
    • http://kunozoxutokusu.mygamesonline.org/54537042112.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/dgiicid/ultimate_bubble_tea_appleby_line.pdfIn PDF document text
    • https://dabamupusoga.weebly.com/uploads/1/3/4/2/134265366/6022657.pdfIn PDF document text
    • https://cdn.sqhk.co/wunemuruk/idghhf0/22135387148.pdfIn PDF document text
    • https://muvebodexiju.weebly.com/uploads/1/3/5/3/135311879/fajow.pdfIn PDF document text
    • https://tapotupuj.weebly.com/uploads/1/3/4/8/134866757/pezinawuvavonoj.pdfIn PDF document text
    • https://cdn.sqhk.co/turomixo/cjfphaY/board_games_for_party.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/types_of_non_arguments_with_examples.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/3507891.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/ibhdwFX/wefajawujuzivabozavaf.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/jiijRVQ/electrical_symbols_chart_lamp.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/192b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_0fe17c7093e740938699d589de2f4e4c.pdf?index=trueIn PDF document text
    • http://kofaxafogi.myartsonline.com/mudogetomuxona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609d2a38-8583-43b3-8902-200a4cd164e1/76711818143.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_5fa428a0f0a64565b760b4cb16fbf14a.pdf?index=trueIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/weighted_averages_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86590640-278f-4d08-af5c-c8feba751190/cuisinart_grind_central_coffee_grinder_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/295a2996-2e3c-4c33-b4f5-bf4af1672ad4/original_cinderella_book_online.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/vocabulary_for_ielts_audio.pdfIn PDF document text
    • http://zimopup.myartsonline.com/pdf_splitter_apk.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_off00019782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19782 5216 bytes
SHA-256: 207048ec8ee7bf82b816e1c1b870d046498b0ab06f897025da3e1ed7b60021c3
font_01_sfnt_off0001a945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A945 12120 bytes
SHA-256: 25c6dd0490d3afb55ab1359028a50e94dbfa9b5085eda2fe82712a78adb29334