Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdef2151b762f110…

MALICIOUS

PDF

95.1 KB Created: 2021-03-15 03:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 69f3d102a049943cc6efa83f40ccb970 SHA-1: 685e7f737df1162bcbe666527707225408db98a9 SHA-256: fdef2151b762f11029082308aec557dc22737c67a76dd1735dc3e385525ddbd5
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting and redirect to malicious sites. The primary malicious URL identified is https://dafemum.ru/wix?keyword=ethnic+groups+in+the+philippines+essay, which is flagged as a known malicious redirector. The document's structure and link farm behavior suggest it is designed to manipulate search engine results and direct users to harmful content.

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
  • 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://dafemum.ru/wix?keyword=ethnic+groups+in+the+philippines+essay In PDF document text
    • https://cdn.sqhk.co/wibononuve/gcghmSv/kovusuwalepu.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/QP9iahW/35739009979.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/ajgggph/mizerexori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_6040dd8466434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501054/normal_604e90b415e50.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/cElgdhi/hashiriya_drifter_1_racing_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456378/normal_6029fd2b1a7bd.pdfIn PDF document text
    • https://zipatusuf.weebly.com/uploads/1/3/4/0/134012633/979965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_6025f04247b33.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/1417990.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/gfHihNU/pebiwefuvigadim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_df19b7fed5954de39149edfd4c275513.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_58fcefb81e7c46d1ad2bb3bb7938e844.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_b991a012281b46f8bde098f52e77c38e.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_9400c4135efa4866adb750b302ccb24c.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_e864cd574dc54e60828a2c319c59fc59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/xilobadosiwuxunoxor.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/free_yowhatsapp_anti_ban.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_d3600f5bf69a442aba0f97715c5752a0.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_ec1a3e3ffddd4730baa3944aec071729.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goviwigax/disturbed_sound_of_silence_piano_sheet.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_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 5252 bytes
SHA-256: 3569006a7e70d1733e71f222bb897f2451927339add8e6091e76af8cb272ed1e
font_01_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 11488 bytes
SHA-256: 846582f04bd1d0f9b12291053c86e0ed974d92bcbfb658d27914e4a8a2bfb958