Malicious PDF — malware analysis report

Static analysis result for SHA-256 db63e868a7c02105…

MALICIOUS

PDF

105.7 KB Created: 2021-06-10 05:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 50ba819f23bfe0132b6e67b00d7b2527 SHA-1: d6c1365e0c8c5988f6e3287d8175826bb18953b2 SHA-256: db63e868a7c02105b71e04c16c14c7a15c6a85dee912546c171c0c5bc04604c8
304 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 hosting, and one critical heuristic indicates it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'Blackberry sth100- 2 manual', and a critical heuristic flags a 'Recovery secret / private key request'. This combination strongly suggests a phishing attempt designed to harvest credentials or sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/123?utm_term=blackberry+sth100-+2+manual In PDF document text
    • https://xaloxegapix.weebly.com/uploads/1/3/4/8/134862860/fomemoro.pdfIn PDF document text
    • https://kepowawovexe.weebly.com/uploads/1/3/4/0/134016687/kozeviwa-xufube.pdfIn PDF document text
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/xupanutubigowifos.pdfIn PDF document text
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/7775d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fee903d05bf5.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/xovimumubitonuwovi.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403408/normal_60b0533f7e44d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fec8c2cbbe3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5fee096b52715.pdfIn PDF document text
    • https://xoxizanelanoruf.weebly.com/uploads/1/3/0/7/130740612/2903632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fe3e37b40472.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/f1f534de-6441-466a-ae0a-120729716139/comic_strip_template_with_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2baa2584-46dc-4d9f-9693-ddbc19c417f7/how_to_play_music_while_working_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de398d4-1a99-49c8-a930-6bae5ef7eaab/is_skim_milk_21_day_fix_approved.pdfIn PDF document text
    • http://ronojew.pbworks.com/w/file/fetch/145001637/8333830774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28d8569-13fe-4837-af6c-fe9d3b22b888/best_book_to_learn_fundamental_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3527be-14f0-4fbe-816c-8315dbb693ff/27213233182.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144532080/how_to_write_a_letter_of_permission_to_be_absent_from_work.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/w/file/fetch/144564753/51001408401.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E3 1724 bytes
SHA-256: d2d65a8b04c555ff691869507fe63aecb975aafdb4ac6af5e2f016a013b6e4a3
font_01_sfnt_off00014f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3E 3668 bytes
SHA-256: dec209824f8c6b2b2b09ea54f379275a7aaea8a4b8f5ef9240ec8a7a379f5ea5
font_02_sfnt_off00015b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8C 5752 bytes
SHA-256: 812853e2b12f42d782f398e9d14c097d96ec37d11ae1706132e04daa9de507ed
font_03_sfnt_off00016f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F06 12344 bytes
SHA-256: 42ddf6e7eac6c85137368465da6110c4316d78301a33451029c7b36c59c6c797