Malicious PDF — malware analysis report

Static analysis result for SHA-256 e871aa106d3fde20…

MALICIOUS

PDF

66.7 KB Created: 2021-01-10 02:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4d306b0078b4bb93c568481fe31fa7b2 SHA-1: 6ccfd003832da4dda77bcaee6df941caee9e4138 SHA-256: e871aa106d3fde2090b9c066c9d12c75d5a96cb426ee057b9477cdc8f6b1db84
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document's content, though obfuscated, appears to be a lure disguised as a schedule to encourage link clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=metrolink+schedule+pdf In PDF document text
    • https://site-1176512.mozfiles.com/files/1176512/city_car_driving_android_oyun_club.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/lewewane.pdfIn PDF document text
    • https://site-1166605.mozfiles.com/files/1166605/jitapujatakimogixogafi.pdfIn PDF document text
    • https://site-1174654.mozfiles.com/files/1174654/12025098610.pdfIn PDF document text
    • https://site-1168222.mozfiles.com/files/1168222/caller_name_id_app.pdfIn PDF document text
    • https://site-1174105.mozfiles.com/files/1174105/84089674972.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/stacked_bob_cut.pdfIn PDF document text
    • https://site-1171887.mozfiles.com/files/1171887/scruffy_beard_definition.pdfIn PDF document text
    • https://site-1177655.mozfiles.com/files/1177655/my_birthday_party_essay_for_class_6.pdfIn PDF document text
    • https://site-1178121.mozfiles.com/files/1178121/64568327240.pdfIn PDF document text
    • https://site-1175129.mozfiles.com/files/1175129/kolobukifoge.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/76128144338.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/wovisak/76747180814.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/xaloxo.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_off0000bf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8A 5100 bytes
SHA-256: de83bcb187d1ad3d06a92d70a15968783605313b5bc5ba736873b663d848a2fd
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 14160 bytes
SHA-256: 9a800742033530b02c9b09be7d85f148d6883a0da4c967a55b52d5e6d9664578

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