Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa250fa30232aa99…

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 02:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9717c886ef3b5b03efddf71abb3305ba SHA-1: 53f9d862e4365264598310dbce26e63c0336f4f3 SHA-256: aa250fa30232aa99cc01925f007919b34c316aa789686ff90e91388f8e478165
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://jacksth.ru/wix?keyword=cold+war+dbq+documents+answers PDF link annotation
    • https://cdn.sqhk.co/verexoleki/83jajrS/elon_musk_mars_colony_timeline.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/dZgd1kh/kezebanex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_600f7bdb7939b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_603792fec15c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_60319c23e8f5a.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/zegavanuwifepud.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/djikWia/29635190311.pdfIn PDF document text
    • http://godotobekof.scienceontheweb.net/samsung_sm-t230nu_screen_replacement.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/29975682927.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/41378089111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5fde2326bd5ba.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/jdheKmz/xibiperiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_600d1514efdc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/stopping_by_woods_on_a_snowy_evening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6500aa56-32b8-4058-bb95-50a5e7497a8c/reset_canon_mp250_printer_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/famutuvupuwigodi.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/14310938652.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/memipitejan.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/autocad_3d_shortcut_keys_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 4036 bytes
SHA-256: 885129771b091e27ed834054eb9e9030c6564af691f6ae2c8378065c1a574cdb
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5348 bytes
SHA-256: bfa8ff3ca8ed38835537619c6a2c7dab4f10afa1b7b3a7197323ec171641899a
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 11044 bytes
SHA-256: d7f8ef0b6f8549465664aa3b948eea96a0fb9c55ee9cb069f9b137576caf8abe

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