Malicious PDF — malware analysis report

Static analysis result for SHA-256 091ba95776a23868…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 01:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dc8fa4c5a019b5126627bbfbd458335f SHA-1: ca8498f19c46c4f65de7b108624afc1d0197e8f5 SHA-256: 091ba95776a238681bd0fb80d7dc2306658ecbab2efa7772e13b7acf579b0c75
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or suspicious infrastructure, suggesting a link farm or redirection scheme. The presence of external URIs and the ML classification strongly suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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
  • 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://nipisod.ru/award?keyword=violin+concerto+in+a+minor+bwv+1041+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5fe1752b965b4.pdfIn PDF document text
    • http://avit0.pro/how_much_does_the_bbg_program_cost8xxxs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_6018140149fe8.pdfIn PDF document text
    • http://hq-cleartv.info/dd_way_of_the_four_elements_revisedfr6uc.pdfIn PDF document text
    • http://tifetatujuvib.22web.org/groom_speech_wedding_template.pdfIn PDF document text
    • http://my-favshop.online/nebutupepuditajudeb298m0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ffe6dd06bd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe857bcab44a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_601db41b1f23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5fe791cfcf1b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_604ff0f99abfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_601b5af01a72b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_60139462f124a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzererelutido.epizy.com/how_to_play_family_feud_virtually.pdfIn PDF document text
    • http://megoger.rf.gd/1124556801.pdfIn PDF document text
    • http://kesewoge.rf.gd/86771144624.pdfIn PDF document text
    • http://tuxizosog.rf.gd/bobol_wifi_wpa2_psk_android_tanpa_root.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/bookworm_adventure_crack.pdfIn PDF document text
    • http://nitilidozunu.rf.gd/what_were_alexanders_accomplishments.pdfIn PDF document text
    • http://najusibajeful.rf.gd/revolutionizing_product_development.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_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 5664 bytes
SHA-256: 00d25b31376d079267c9735ff3613f7ae9cd61251bf65b71572ed6151961104f
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 12020 bytes
SHA-256: 655f2912872f7c3bac163db0bb6dd832942b8a6024e5b6ba0cbcccc425b5b07e

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