Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f82b6ab4ff271e…

MALICIOUS

PDF

74.4 KB Created: 2021-03-04 03:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 191e8a8f981fe55fbaf1fac5d0f9b875 SHA-1: 85685887456daf69a41f92550818986fa4bd3e11 SHA-256: 00f82b6ab4ff271ea3226d703b1839d07afc8f702cb0b83181d56c0b6b6193de
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru' as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of multiple links and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=baby+groot+dancing+drawing In PDF document text
    • http://fegivate.medianewsonline.com/integration_of_cos2x-sin2xdx.pdfIn PDF document text
    • https://pewidujatiw.weebly.com/uploads/1/3/1/3/131381722/jisavonitinabojubeg.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/je0MQhb/98891520951.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/dilogu.pdfIn PDF document text
    • http://rozogididibusar.sportsontheweb.net/human_geography_a_short_introduction_2nd_edition_free.pdfIn PDF document text
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/2f6daeb18e.pdfIn PDF document text
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/2570290.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/how_to_use_proctor_silex_coffee_machine.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/5979255.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/63131308263.pdfIn PDF document text
    • https://cdn.sqhk.co/mawedabe/4ieRKid/tafunorevaxeginulegik.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/58411433286.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/aiggdeL/golf_clash_club_max_upgrade.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/tokopulidutowubuzixajazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/4258190056.pdfIn PDF document text
    • http://davutawopoban.epizy.com/tv_buying_guide_singapore_2019.pdfIn PDF document text
    • http://xixupokolaxusuv.epizy.com/comprehensive_cxc_french_answers.pdfIn PDF document text
    • http://wubalele.rf.gd/address_to_post_budgeting_loan_form.pdfIn PDF document text
    • http://kenefokugoxetu.rf.gd/caupolican_ruben_dario.pdfIn PDF document text
    • http://lepoxas.rf.gd/aspen_plus_11._1_user_guide.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_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 5280 bytes
SHA-256: 40b9716831f84ff93cd5a8bf183d60d620ce8cccc53b0e3d905614e8f0df0b76
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 11016 bytes
SHA-256: 3d08c4932db7d1ad61d95253a047f3efc349a83863dec915cf5ea2c565aff422

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