Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3a0daa0dab64a5…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 22:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c3190c932b916496365d8d3142c5a7f8 SHA-1: 7036a8d562a58f95999b968c7a41c2521eff0ca3 SHA-256: 5a3a0daa0dab64a5d2097712df844ad6dfed28823bfd8e55d948b745de1b5b06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=the+book+of+life+2014+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374696/normal_6007e52287a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fd6b23f617b1.pdfIn PDF document text
    • http://kupelobivinix.22web.org/58434768190.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/nasinagakogew.pdfIn PDF document text
    • https://zakulupibuwuvos.weebly.com/uploads/1/3/4/6/134686441/gepuge.pdfIn PDF document text
    • http://gexifivavipi.iblogger.org/vezalopomudaniwofirog.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/tewojid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475716/normal_5fec7f1899038.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/takusixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fcfec6ad46d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_5fd08f31bfe46.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/2380259937.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/16732931994.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/jokirokexi-vawipagib-menam.pdfIn PDF document text
    • http://nowatora.22web.org/sciatica_management_nice_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limoxukuk.atwebpages.com/78291924471.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/equality_act_2019.pdfIn PDF document text
    • http://fixekemira.epizy.com/after_effects_shortcuts_windows.pdfIn PDF document text
    • http://vetoliwageje.rf.gd/the_presentation_of_the_self_in_everyday_life_summary.pdfIn PDF document text
    • http://vofaxov.epizy.com/is_theory_test_centre_open_today.pdfIn PDF document text
    • http://rowavironipomiz.epizy.com/youth_daughter_piano_sheet.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5240 bytes
SHA-256: 81ba7f5376b10facf8cc307ecaea5f7b9d144049906a8e1d6f3b6f17bffa8b26
font_01_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 10944 bytes
SHA-256: 0f01f632f5ce61bcf1df4e4d924356982a93e45f08da7bd398e179e14c5f4e60

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