Malicious PDF — malware analysis report

Static analysis result for SHA-256 b881c02f28c5b25b…

MALICIOUS

PDF

85.8 KB Created: 2021-06-08 02:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aa0b7304f4628f2ad2e51b904bf6e809 SHA-1: 3e83283cab72d45f40198a3708fe9a63e77b1874 SHA-256: b881c02f28c5b25b9e60b3671db4d5ab3cdaf011be6fa8b7dadd215a7fac03ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure pointing to 'https://druttle.ru/123'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/123?utm_term=arcgis+diagrammer+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_601a61eeeda26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_6050690f1daac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd61e06761eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_6017a8a3e26f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445340/normal_5fe0eeaeafd70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_603c0422c3a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371266/normal_5fff1afbf1740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevesefazoga.pbworks.com/f/local_vets_near_me_24_hours.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/xarixugalu.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144810339/vasajefozegewanazasa.pdfIn PDF document text
    • http://bilabegape.pbworks.com/w/file/fetch/144441678/jezevinoziduxavege.pdfIn PDF document text
    • http://tagiruxot.pbworks.com/f/wings_of_fire_starflight_x_fatespeaker.pdfIn PDF document text
    • http://nerobedevu.pbworks.com/f/macleods_all_product_list.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/861433690.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144452991/pinixuliwa.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144800070/xarego.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144422037/most_common_words_in_english_language.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/f/what_is_the_new_snapchat_update_july_2020.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144821418/ap_stylebook_2020.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144668613/biblia_rvr60_palabra_clave_estudio_diccionario_hebreo_y_griego.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144651777/34653317143.pdfIn PDF document text
    • http://nawujewo.pbworks.com/f/luvava.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144506991/benim_konuan_tomum_android_oyun_club_hile.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/nomafudabop.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/dozixopovejojimegonepumo.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_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 5216 bytes
SHA-256: 164305aafdaffcb8d1b3a6666510f0f8fb5856836ac0e829e6b15eb4040776c1
font_01_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 10944 bytes
SHA-256: 909c2902b03493f1c9063e2ce28bc4773a6c1551ab7162185f57e79180ade0d6