Malicious PDF — malware analysis report

Static analysis result for SHA-256 102dd0ab78c1d1e6…

MALICIOUS

PDF

81.3 KB Created: 2021-01-13 05:58:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d2ddc03cb50bcc35a4003f0335d2c68 SHA-1: edb00d900dc703b1dabcdb95cb2fe08817aacc7f SHA-256: 102dd0ab78c1d1e61d4f8335b8582c4a0fffa1550ca528c8196573621d8d1c86
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains numerous embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=interpreting+bar+graphs+worksheet+pdf In PDF document text
    • https://site-1178522.mozfiles.com/files/1178522/child_travel_consent_letter_uk_template.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/airserver_connect_apk_full.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/equalizer_audio_pc_windows_10.pdfIn PDF document text
    • https://site-1206689.mozfiles.com/files/1206689/67964138956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387704/normal_5ff7b20e888f4.pdfIn PDF document text
    • https://site-1083884.mozfiles.com/files/1083884/xiaomi_mi_9_android_10.pdfIn PDF document text
    • https://site-1178359.mozfiles.com/files/1178359/42313520663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f90fa986de63.pdfIn PDF document text
    • https://site-1176136.mozfiles.com/files/1176136/22481116442.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/fezenur/xafival.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/anveshi_jain_app.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_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 5504 bytes
SHA-256: 7aafd9e9bd8eeb4e7bfdc60eaff8a02841e74b4f8600f2076f157504899982f9
font_01_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 11008 bytes
SHA-256: 9d1e4fa901b4fc11b585dfff7d27b5b32db7e189e195843070a53b207c3a99dc

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