Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c3a85acf08fd7b…

MALICIOUS

PDF

119.7 KB Created: 2021-03-18 05:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9092dc7f6731eee4bd3820a390a69f5c SHA-1: 9c27842c1f22c3ee3a41c35e4bd60a28c9c52220 SHA-256: 98c3a85acf08fd7b0d91dca574dd034a777ef942927aea3da394ec1a6876f7a2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://botokaw.ru/strik?utm_term=what+did+guerrilla+warfare+mean PDF link annotation
    • http://pagexanomala.22web.org/bapewipelusofuzarival.pdfIn PDF document text
    • http://pejagepelif.iblogger.org/4781799863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5ff90acb77677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fd8d78a83c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_602b895a819d3.pdfIn PDF document text
    • http://fuziral.iblogger.org/rezoporaxogaz.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://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_ab9b1212214141f89cef85a40cc669ce.pdf?index=trueIn PDF document text
    • http://xugeseza.epizy.com/tedutinikupaded.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/history_of_american_civil_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db011f3c-63c1-4457-be29-4bb781f88121/boxewakotip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9404382c-49d7-45e0-b6ff-6e1ba8827520/brother_lc101_printer_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2999a600-a302-4afa-8ee9-95f8fdbb0b4a/41396977365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44260cdd-72a8-4046-af02-9661e409af62/who_is_david_hume_and_what_did_he_do.pdfIn PDF document text
    • http://zimakufupakafor.rf.gd/37578295218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25917f93-8c60-4890-979b-3b9d8797c1e6/is_the_fitbit_flex_2_waterproof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a70d1e-8c61-4ebf-83db-49863f9583ab/47402792516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55a54aa-3f7a-4987-8cda-3b9118c346e8/can_i_make_my_own_google_cardboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296026fc-bfb0-4c01-8a33-2f474177f44e/center_point_scope_4x32_price.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_504e78d269404c0f82dd9333c2261884.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waduzirader/20562192616.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/b_tech_malayalam_movie_full_free.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_off00018f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F41 5020 bytes
SHA-256: f1cc1c834481981c18234e9adf46d7deb3bdcba711593b45e8d39be307e94a9d
font_01_sfnt_off0001a03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03E 10212 bytes
SHA-256: 67c33f156ca4df8b38e874d324841ecae95e378b359651d9122ae93850f4b7de
font_02_sfnt_off0001c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C326 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176