Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2aadcdc979aead5…

MALICIOUS

PDF

77.4 KB Created: 2021-02-27 17:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ae8e034503108ad947d295f36085d5b6 SHA-1: 1ebb42a83de1bc614d6a1c48d22d3ece9e9f5b05 SHA-256: f2aadcdc979aead5424d475a391d574bf12208a39d004af6b24273c85acfe5fe
126 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, presenting numerous links to disposable domains, likely to trick users into downloading malware disguised as legitimate files like drivers. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the use of multiple distinct hosts and disposable domains for this purpose.

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://midufefew.ru/award?keyword=conexant+audio+driver+windows+10+lenovo+g580 PDF link annotation
    • http://cooldomen.space/447816224033aerr.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/el_solitario_horacio_quiroga_resumen_corto.pdfIn PDF document text
    • http://uspeh.icu/bohat_tta_chud_tta8z2y8.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/11_22_63_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_600fe7a60ace0.pdfIn PDF document text
    • http://pro-komp-master.website/wofukofa02tkq.pdfIn PDF document text
    • http://birjand.design/economia_ambiental_charles_kolstad_gratisizvew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5ff6747d7acae.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/Z0igDpD/tales_of_windspell.pdfIn PDF document text
    • http://bloomwithdeanna.com/32284528929qp7gh.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/mjepagf/death_city_zombie_invasion_mod_apk_download.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/light_blast_projector.pdfIn PDF document text
    • http://lifeit.pro/android_emulator_pc_1gb_ramo02eh.pdfIn PDF document text
    • http://easy-money-cash.space/properties_of_addition_worksheets_grade_25pqul.pdfIn PDF document text
    • http://fastcreditreport.info/polaris_booster_pump_installation_guide2gf1p.pdfIn PDF document text
    • http://f13x.xyz/xepamuksn6q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/20709603045.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5632 bytes
SHA-256: 99a1ab777e50a7a8c5bceb8aa81ea148262f1f072416f1874ab9ecde33053639
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10768 bytes
SHA-256: 3d05284c91fc21a5d6e5e023ddcdb67e24fb58a53f38287e5bc5bc325af136a9

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