Malicious PDF — malware analysis report

Static analysis result for SHA-256 638240da32fc7280…

MALICIOUS

PDF

119.1 KB Created: 2021-01-19 17:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 193deae7d5ab416ee659e9c34f57f73f SHA-1: 2371b43438028597d89846113bdd407586046732 SHA-256: 638240da32fc7280785e28c2dcf49f82044fae26419728ea33ab088f3c04f3a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one pointing to 'trafficel.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

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://trafficel.ru/aws?utm_term=absenteeism+thesis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480732/normal_5fb54b95a2ae7.pdfIn PDF document text
    • https://fibutoledul.weebly.com/uploads/1/3/2/7/132741024/6804528.pdfIn PDF document text
    • https://site-1252772.mozfiles.com/files/1252772/kuvarenavesimiriw.pdfIn PDF document text
    • https://site-1225904.mozfiles.com/files/1225904/patabababinedexada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5fabe7143d7c1.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/zodezisiwud-pupefomef-sagaze-lagirod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f9a6b41d2040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5ff5941f3045d.pdfIn PDF document text
    • https://site-1239972.mozfiles.com/files/1239972/lukajosogolirefeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f87b7a64be00.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/nebajagibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5ff5c83a4f647.pdfIn PDF document text
    • https://site-1185125.mozfiles.com/files/1185125/new_version_whatsapp_plus_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369935/normal_6003501639771.pdfIn PDF document text
    • http://sarelalitodidi.66ghz.com/cisco_network_monitoring_tools_free.pdfIn PDF document text
    • https://sibinepenisux.weebly.com/uploads/1/3/4/4/134467302/fejulepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojodidekojamu.rf.gd/dofoxotilomexajilojunide.pdfIn PDF document text
    • http://dobupefibukin.epizy.com/netflix_movies_to_pc.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/online_name_correction_in_up_board_marksheet.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_off000198d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198D8 5072 bytes
SHA-256: c967d00835948446e98ec10af387a95fe2f707f8548ee683bb7e444b459a23fa
font_01_sfnt_off0001a9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9F4 10848 bytes
SHA-256: af15b4fb43ea7ad2eaa1a0ecd28f63b19bb1bcd3a0d25f180a9efbffa35f4cb7

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