Malicious PDF — malware analysis report

Static analysis result for SHA-256 4274c15906274ad7…

MALICIOUS

PDF

69.7 KB Created: 2021-01-20 05:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9a16126d149732954af29e9fce338ce0 SHA-1: 97deb8757c3a8c9aa32dcd3dd47064ca465c8226 SHA-256: 4274c15906274ad71259d55c4b4d742d1ffb597ab861922dc15beb65d8ee85de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=5e+black+tentacles PDF link annotation
    • https://cdn.sqhk.co/vujenibolo/8iehj8l/naxitogepetarifafo.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/grjegcw/contacts_exam_near_me.pdfIn PDF document text
    • https://site-1181732.mozfiles.com/files/1181732/bukagaleluzigilegexodexo.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/erkjdgh/gazadadimubedofuxaziw.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/limutibiwukujazubutunu.pdfIn PDF document text
    • https://site-1180773.mozfiles.com/files/1180773/phrases_and_sentences_worksheets_for_kindergarten.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/34990212187.pdfIn PDF document text
    • https://site-1194448.mozfiles.com/files/1194448/asiana_airlines_pilot_names_colbert_report.pdfIn PDF document text
    • https://site-1167964.mozfiles.com/files/1167964/terraforming_mars_all_expansions_review.pdfIn PDF document text
    • http://degitowexara.iblogger.org/wedding_anniversary_images_with_name.pdfIn PDF document text
    • https://site-1223593.mozfiles.com/files/1223593/29646983824.pdfIn PDF document text
    • https://site-1178171.mozfiles.com/files/1178171/azure_vpn_gateway_private_dns.pdfIn PDF document text
    • https://site-1192787.mozfiles.com/files/1192787/depuwiloxilujuledop.pdfIn PDF document text
    • https://site-1173349.mozfiles.com/files/1173349/game_center_ios_14.pdfIn PDF document text
    • https://site-1173368.mozfiles.com/files/1173368/27133736802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/air_crash_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/about_time_theme_song_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/cercles_de_la_forme_nation_horaires.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/jibom.pdfIn PDF document text
    • http://wajiletum.epizy.com/former_ceo_of_popeyes.pdfIn PDF document text
    • http://retudazugo.rf.gd/77099989988.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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 4932 bytes
SHA-256: 187dab44dbfc45a10651c30b5f85cd99f802ebee945bd5bc544aa14fd352ff66
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10816 bytes
SHA-256: b607c465c6b6c51f882c32b6dc346579fce62132bd63395130d55e9ecd7df128

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