Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8d7b46aadf72a3…

MALICIOUS

PDF

73.1 KB Created: 2021-04-23 15:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e463fc927a790a9131b048df1f631f93 SHA-1: d58c0670b0803dbe667b21fa190eab89189fe286 SHA-256: 3c8d7b46aadf72a33fec893769ea392f5ee38de5c6a7308f0c6c05a6fda1ddc2
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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://www.telluridescience.org/sites/default/files/tstc-applications/pagasumoxozodaxatukaliwus.pdf In PDF document text
    • https://www.mainephilanthropy.org/sites/default/files/wimatetomowitiki.pdfIn PDF document text
    • https://www.afscme65.org/system/files/webform/rerezuduzolorefa.pdfIn PDF document text
    • https://www.dgs-interparts.be/sites/default/files/60165950635.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/79062027218.pdfIn PDF document text
    • https://www.visitsavannah.com/sites/default/files/webform/90994069376.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/56601188302.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/zivexovoburowunaxomenip.pdfIn PDF document text
    • https://www.mothercare.ro/sites/default/files/webform/resumes/28941778760.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/82598578892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=materiales+de+panel+solar+caseroPDF link annotation
    • https://drones.princeton.edu/system/files/webform/janewif.pdfIn PDF document text
    • https://thesanfordschool.asu.edu/sites/default/files/webform/moxogugudufagelo.pdfIn PDF document text
    • https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdfIn PDF document text
    • https://thesanfordschool.asu.edu/sites/default/files/webform/xumigisapiwonatidokababup.pdfIn PDF document text
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/zupedofijemurak.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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5072 bytes
SHA-256: badcc831055f57cb9eed2c53cf9e83db618a4974add018462a38489f69b3189a
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 11672 bytes
SHA-256: 2186e84c0723b1ef025b6c52d4d8f1aceb3ca555199bc88b406ce47b64e4ed87

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