Malicious PDF — malware analysis report

Static analysis result for SHA-256 745f1263df612789…

MALICIOUS

PDF

68.6 KB Created: 2021-02-23 00:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 28d96c00ff52dce10e41a6087f78ed4a SHA-1: dce934109a215b9ceccffae378a954725fc4e265 SHA-256: 745f1263df612789217c4dae90d95f622f2b365b87d2ab5480671646178abb48
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, https://seumenha.ru/wix?keyword=when+was+languages+by+carl+sandburg+written, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/wix?keyword=when+was+languages+by+carl+sandburg+written PDF link annotation
    • https://cdn.sqhk.co/nugopanage/jcjjifw/7_wonders_of_the_world_list_2020.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/db05f9c97e7.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/AgcYKfu/fawowujuzut.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/hFhhdDe/nirigajixi.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/dgggfie/download_game_stunt_truck_jumping_mod_apk.pdfIn PDF document text
    • http://litamomun.22web.org/pikurerekonegewusutaf.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/cF6QgfB/lonejudesatuti.pdfIn PDF document text
    • http://fesagudomaluke.22web.org/90455008110.pdfIn PDF document text
    • http://xuguxujew.iblogger.org/carousel_slider_bootstrap_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedaremix.epizy.com/watermark_video_android.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/tripadvisor_instant_booking_platform.pdfIn PDF document text
    • http://limebeb.epizy.com/resume_template_for_fresh_graduate_without_experience.pdfIn PDF document text
    • http://jupilabezisetif.epizy.com/dish_tv_channel_guide_atlanta.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/msi_z87-g45_memory_compatibility.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/multi_store_ecommerce_template.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_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 5548 bytes
SHA-256: 59d0c8a7feed13ab415cbf4f7d37b3777de2dd9a78461c2d6988d1840c5a7a34
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 9984 bytes
SHA-256: f465846330cd08dd34e0f74763923768e1c3e72864449d1333f14ea297955f2c

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