Malicious PDF — malware analysis report

Static analysis result for SHA-256 363c2cabf78ccfcc…

MALICIOUS

PDF

133.8 KB Created: 2021-04-30 13:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 03bb76e4aad03dfc3b18ec7453f11953 SHA-1: 65299df6f18351728042bf86734641c2c0950377 SHA-256: 363c2cabf78ccfccd655a969d5bc301a107d622ba68b26d6086c7e9ca317bd01
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URLs point towards a common technique of luring users to compromised or malicious web 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
  • 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://fokemale.ru/strik?utm_term=army+weapons+qualification+points+chart PDF link annotation
    • https://satalediveli.weebly.com/uploads/1/3/4/0/134018026/20ad7b22.pdfIn PDF document text
    • http://clipshd.design/botifejurujezebowovacyffr.pdfIn PDF document text
    • http://axacheat4.xyz/reaper_pepper_seedsxl6rx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_603ab95590723.pdfIn PDF document text
    • http://evilcheats.fun/foodsaver_problems_with_vacuum1kctz.pdfIn PDF document text
    • https://cdn.sqhk.co/tireronerogo/19gdqgh/rufowavu.pdfIn PDF document text
    • https://cdn.sqhk.co/jifexekezeli/ZdidDC5/nedetodolenorusefafes.pdfIn PDF document text
    • http://hiziryigit.online/721148050855cia1.pdfIn PDF document text
    • http://supernefritroller.xyz/cdcr_visiting_form_for_minors6ybg1.pdfIn PDF document text
    • https://pedadadaroteb.weebly.com/uploads/1/3/0/9/130969242/15d36.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/xuxojijekubir.pdfIn PDF document text
    • http://larts.digital/puzeluwububo2248k.pdfIn PDF document text
    • http://microdigitalmeter.xyz/4_string_bass_guitar_chords_for_beginners7aj1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_60165151b1c2f.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/9216112.pdfIn PDF document text
    • http://istlan.fun/word_of_god_images_free_download53kys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_3cc1cf58c5b04327beb0d37e1122ce42.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_9c57f02ee0294adeb3a7c4ba62ef4312.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f75028b96898433685417d20f235f170.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB12 5564 bytes
SHA-256: cd7463b33ee6f5f834e444c6d254e498e8aa3a26c162dd7dc5e7f13e747b29cd
font_01_sfnt_off0001cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEF 11244 bytes
SHA-256: 53303e5149b2b61d5c592a5788fb5bc1e7cd37ba5cfc85daece1b09612bc99f8
font_02_sfnt_off0001f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F489 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330