Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c2e4ed8d30915e…

MALICIOUS

PDF

78.4 KB Created: 2021-02-10 00:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18e0bfe6f2aee84f28944c49979968a3 SHA-1: 0cdaa057be56d77384de8624302849b820631f99 SHA-256: d5c2e4ed8d30915ec64396eca80627a7ce81f328a8507058df62bd832e8d8ebf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating it functions as a link farm. The embedded content, though heavily obfuscated, suggests a lure related to "best broken heart songs". The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware via the linked PDFs.

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://jacksth.ru/aws?utm_term=best+broken+heart+songs PDF link annotation
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/nasupetik-piviziwo-jivususeve-rozuwoxenusubu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/YepkIYe/39852041535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5ff2bf3472cd4.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/vowozoxuj_nazujozo_bipolaxami_kupafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_602060ea241a5.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/hiiiOia/minecraft_java_edition_mods_free.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/vivevuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/iighphh/kunodi.pdfIn PDF document text
    • http://didavixakodix.22web.org/fomuwaroriburizuzipalifu.pdfIn PDF document text
    • http://dreamingdeveloper.com/adsense_responsive_blogger_template_free5crmq.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/jck3ojc/wallpaper_background_steven_universe.pdfIn PDF document text
    • http://chuvashovfamily.ru/lire_le_ralisme_et_le_naturalisme62uga.pdfIn PDF document text
    • http://iwhite.space/trasmaco_de_calcedniaxub4y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fcad21a70ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_5fd1cfcd26efe.pdfIn PDF document text
    • http://bitjoms.xyz/24227284647sokel.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hbhd3ib/95759160916.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/tomepeviv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 4908 bytes
SHA-256: fd1a5054dc2d71985e0777de5523063ef45e1f878a8aaa5d61163d2255be0452
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10436 bytes
SHA-256: 8640fa9e795fc5cfb3007aabcf9f5d15fdb5b1c7e5413c8f9aac9d26538ea945
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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