Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8da5b83f6a72f5…

MALICIOUS

PDF

79.3 KB Created: 2021-04-21 14:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b6fec6e783ff3ff815ddc97af2b3a206 SHA-1: 8a16a84bc01983efa7837f06a806048fabf30567 SHA-256: fb8da5b83f6a72f50fa8e38b72b51b789a76c0840ccd1eeaa9147452fd71d5b7
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be related to search terms, suggesting a phishing or scam lure. The presence of multiple external links, including one pointing to a potentially malicious domain, indicates an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=attack+on+titan+characters+names+list In PDF document text
    • http://rokonedewok.22web.org/lipifabiwijani.pdfIn PDF document text
    • http://ritebutiliw.22web.org/17746041673.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/panalipolifod/75387212612.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_d4a97081100849a6883025f013b03a34.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_1694e45990cc4f1187a6fe39408eb8be.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_20c67d79eb9a4745afe94304ccd8d5f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/differential_equations_and_linear_algebra_3rd_edition_chegg_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/98201103657.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/juvefo.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_999d4fa75a4b4fafb770c78ce19d6012.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/how_to_calculate_product_cost_per_unit_using_absorption_costing.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/who_is_considered_the_most_influential_person_in_history.pdfIn PDF document text
    • http://gulavutimomoxu.rf.gd/tuzedapinaranowa.pdfIn PDF document text
    • http://xekifoxudiduvaf.rf.gd/lozuwogokubixoveliwidun.pdfIn PDF document text
    • http://jozapatoxijoraw.epizy.com/age_of_empires_2_no_cd_download.pdfIn PDF document text
    • http://zelanokavekav.rf.gd/94422150497.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/rovalusomamuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/zapedoxaxatufinugexe.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/brazil_dhol_original_song.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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 4880 bytes
SHA-256: 8cfe5ca96f2a31f8c57533d0495ca61bb6b74db7141dafcc222b7a6b6321299f
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10724 bytes
SHA-256: eee33c5338aec37ff3eddffc2b7c8d67ce2e3d8ea9f07eaf3a06d4c2de479fa5
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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