Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ce0cc963d2bac6…

MALICIOUS

PDF

66.6 KB Created: 2020-11-19 20:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d30df1cd8590a31fdbaf73dc1aaece83 SHA-1: b8401a05167e96c9edcb0c4878578e0fa34b9419 SHA-256: 85ce0cc963d2bac6c55d03d967da5fb2b495cf1fb294ed151d745ff996ac75f4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics identifying it as a malicious redirector link and a PDF SEO link farm. The ML classifier and ClamAV also flagged it as malicious. The primary purpose appears to be directing users to potentially harmful external sites, indicated by the presence of malicious redirector URLs.

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
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffmen.ru/123?utm_term=west+jefferson+hills+school+district+ranking In PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/sufoji.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/wimifekomexix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f874d172004f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5f9176c6b627b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f8735d3ee916.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/wozejikemujo_jubajijiz_wurevinoboj_wowigixaduket.pdfIn PDF document text
    • https://mekukirofex.weebly.com/uploads/1/3/4/5/134589797/fiwexenap.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/pabetezujevusobif.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/vibove/wray_high_school_football.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/andi_mack_season_2_episode_17.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/99874324501.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/bruni_karr_property_management_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/apple_ipod_touch_manual_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/cameron_jordan_injury_report.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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 5436 bytes
SHA-256: 9a33827eb87e84edf7a0c0afc40cf63cfb4c957dc15c61e386c5941e979db4f5
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 10932 bytes
SHA-256: 5d4c8acef219efc0d73eb7d6b7f7f9a61a7c86ed67dbd1ac36447e53c9a20660

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