Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77c28e613da13de…

MALICIOUS

PDF

80.7 KB Created: 2021-03-02 14:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: def5c908bd2c6269b06d4905f9bdc7ec SHA-1: 090e686757fc88d977a14f588925d47d4d2250b6 SHA-256: c77c28e613da13dea4543f279c2029ced83c56bf813b7e83c13c8d2a589089bf
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 hosted on disposable domains, suggesting a link farm designed to drive traffic to various websites. The presence of a URL like 'https://botokaw.ru/aws?utm_term=is+the+stihl+ms+271+a+good+saw' indicates a lure to a potentially malicious site disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/aws?utm_term=is+the+stihl+ms+271+a+good+saw PDF link annotation
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/nomavonovo.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/xituzupori_meluviri_xufisusozimo_viwenino.pdfIn PDF document text
    • http://my-favshoph.online/xemiwewasaresekis867t.pdfIn PDF document text
    • http://fakaripeti.xyz/madame_bovary_2014_actorswast1.pdfIn PDF document text
    • http://doordash.fun/53518423468fippz.pdfIn PDF document text
    • http://discout.online/sivaji_the_boss_telugu_movie_mp3_songs_downloadx3szr.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/5Fajbgc/exceed_by_money_network_mobile_app.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/pibesimifur.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/g5Sjajg/71003021666.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/jeSgjZx/bkash_app_install_offer.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/c4e268635.pdfIn PDF document text
    • http://front-glass.space/easy_chocolate_cake_recipe_without_egg_and_ovenk35m4.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/levodopa_davis.pdfIn PDF document text
    • http://findattime.com/what_is_hypertext_in_reading_and_writing_skillsgn2om.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/namalevilakoles_nusaro.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/lowexinofuknze.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/b1fc8.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_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5120 bytes
SHA-256: e934fc5d95255bb4432e29222743598fb0a1145c08252a0f81fe05d7367befd8
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 11148 bytes
SHA-256: 56082db6ba0893d4a4d3278b83d3dc6a4523e9005fe38a4754d25f39ef09dc0a
font_02_sfnt_off000127a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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