Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc501d743468964…

MALICIOUS

PDF

81.5 KB Created: 2021-04-17 19:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: df04cf29febad8b1c3fb6b22623edd58 SHA-1: e76e7665d376630ea6ed418fd20562a2e9005c0a SHA-256: dfc501d7434689643806ef387951424c0dfbd570e974528c15adf796d45be663
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'data analysis tools and techniques' and 'wkhtmltopdf', likely serving as a lure.

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://baarspo.ru/strik?utm_term=data+analysis+tools+and+techniques PDF link annotation
    • http://gosoxegekiri.mywebcommunity.org/atlantic_fleet_free_download_pc.pdfIn PDF document text
    • http://jesiguvolen.22web.org/family_and_friends_5_class_book_answers.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/61616439337.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/10311557941.pdfIn PDF document text
    • http://edevletorg.com/9190953024767ec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_5fcce69025511.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/28123804633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_60664504636a3.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/hansel_and_gretel_short_story_in_german.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/96926826234.pdfIn PDF document text
    • http://nanolenka.xyz/similarities_of_text_talk_novel_blog_and_hyper_poetry_in_terms_of_structurehdvs3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6050f78c62f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_602bfbd117933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fd3cd364347b.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/how_to_change_battery_in_digital_meat_thermometer.pdfIn PDF document text
    • http://donbetosstreettacos.com/slow_motion_video_software_freenu9lz.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/41239141180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiforeru.atwebpages.com/90321544401.pdfIn PDF document text
    • http://wenavigabex.rf.gd/kivefanipida.pdfIn PDF document text
    • http://nisanasedupava.epizy.com/41465261836.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/43552919274.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/el_desafo_del_amor_40_das_pelcula_completa.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/liwomufokajopulolevosa.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_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 5160 bytes
SHA-256: d7173c56503bae56ecc77d4a7dfb674bebee68a2b6dc6b440f2a78a73705f5d1
font_01_sfnt_off00011492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11492 10720 bytes
SHA-256: 47946c5225331543d90c23068f77072cde37c9ff0df408bf763123232fef4688