Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d913b0c86921554…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 10:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27c77d8fbee4d162fb031b29bd8432eb SHA-1: 76342dcd082194b0fe43038acde960deca845730 SHA-256: 9d913b0c86921554c0a93945f2772fa295263f1af91996677acd4f7308aea0f6
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, likely for SEO manipulation or to host phishing content. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it could be used to redirect users to malicious websites, potentially for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=cell+block+tango+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/migukosodaza/Lbib3gi/flight_simulator_2020_vr_support.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/6hjyuN0/cartoon_network_games_50_in_1_download.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/dhfihib/play_store_apk_for_galaxy_y_s5360.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/2031511.pdfIn PDF document text
    • http://promooffer.site/bartender_study_guide7hwy0.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/igggif0/tomah_wisconsin_tractor_pull_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/7qheVjj/itopia_apartments_st_pete.pdfIn PDF document text
    • http://ejinaya.com/vigukalejiduru99hs5.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/rGjbia2/quran_recitation_with_english_translation_free.pdfIn PDF document text
    • https://rokerisokexojud.weebly.com/uploads/1/3/0/7/130738924/f9c3bae95.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/iaagh6v/phage_therapy_and_antibiotics.pdfIn PDF document text
    • http://fbcopyright-center.com/kubegixejobnh.pdfIn PDF document text
    • http://igcopyrightclient.com/mp3_player_manualeanco.pdfIn PDF document text
    • http://sikovagaxuwe.22web.org/pusivoboruwoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_365fadf7950b42f89575202e013b3dc9.pdf?index=trueIn PDF document text
    • http://lurapuven.epizy.com/2011_sonata_maintenance_schedule.pdfIn PDF document text
    • http://diretisen.rf.gd/13548624407.pdfIn PDF document text
    • http://jipawivenuzinu.rf.gd/74328816548.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_0dd8cc31526048488881f31c29138205.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 5580 bytes
SHA-256: 7bb6afcbfe2328f1594f5bff25e85cd68bfbfb6039362e4620303dcaf71316af
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 10884 bytes
SHA-256: 979967ef83632ecd9b8518e5453257853d183d780d0123ea6b700c318ab81316

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