Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba469990ab34415c…

MALICIOUS

PDF

78.6 KB Created: 2021-02-04 09:18:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c67a295c1a563a27fd42a0d092344834 SHA-1: ee8f6e54e86e6e319cc590a29c6bc6a42d9bf470 SHA-256: ba469990ab34415c26c17c9b37566903c5659fb2f324fe72843e6fc20d43c32a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with 'https://maypoin.ru/aws?utm_term=quickbooks+pro++link' being a prominent example, suggesting a phishing lure related to financial software. The document body, though heavily obfuscated, contains references to 'Quickbooks pro link' and 'wkhtmltopdf', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/aws?utm_term=quickbooks+pro++link PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417313/normal_601b3ab43cd5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fe32ff8da642.pdfIn PDF document text
    • https://gokaxavel.weebly.com/uploads/1/3/5/3/135316782/7674583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425926/normal_5ff4dcecd1f92.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/jigixovufi.pdfIn PDF document text
    • http://xomuxeje.22web.org/tesla_annual_report_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5feec62b1f436.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/jifedefujodu/define_binary_form_in_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/91662368692.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/beginner_classical_guitar_tab.pdfIn PDF document text
    • http://kubagaxupusu.epizy.com/86260999364.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/christmas_carol_songs_mp4.pdfIn PDF document text
    • http://roluvad.epizy.com/greeting_card_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/mathworksheetsland_scientific_notation_addition_and_subtraction_answers.pdfIn PDF document text
    • http://nerokigonone.rf.gd/acceder_a_son_icloud_sur_android.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_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 4980 bytes
SHA-256: 968e96344d475485abc8fc97d2fd2421b9e66eb57b4a8af5d5ac1f2282c08b71
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 11064 bytes
SHA-256: 032657865815afdec9ffd5f7236dff55e80a274294ceb1912bf8ea28e16eb3e4

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