Malicious PDF — malware analysis report

Static analysis result for SHA-256 914932f41a3b51f0…

MALICIOUS

PDF

76.4 KB Created: 2021-03-08 19:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 02d460bd6043f6e5f02b15a61e152e72 SHA-1: 255b1f0d348370cb416dc8d8258228d93e3ab626 SHA-256: 914932f41a3b51f011238f587204fab02655ced5f13531ffa357fb64caf092a8
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body is heavily obfuscated but contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of links to disposable domains and redirectors indicates an attempt to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/wix?keyword=merge+dragons+cheats+challenge+26 In PDF document text
    • http://lalashoppen.online/update_windows_10_pro_terbaruqq8tn.pdfIn PDF document text
    • http://paruxezogu.mygamesonline.org/thoth_tarot_cards_ordo_templi_orientis.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ejfibgI/vejagivaxemipavumamas.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/30580024625.pdfIn PDF document text
    • http://criticcxck.space/counting_coins_worksheets_for_1st_gradedru60.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/hggdhjl/keneja.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/the_negro_speaks_of_rivers_poem_analysis.pdfIn PDF document text
    • http://xikimifo.66ghz.com/coniugazione_verbo_ascoltare_alla_forma_passiva.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/jehe8jd/competition_plus_shifter.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/wcjdOEP/ionic_pro_turbo_blades.pdfIn PDF document text
    • http://edarudost.online/86942395728kurnq.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/rulenivukimuxagulovegofu.pdfIn PDF document text
    • http://tonagruz.ru/jejekmp7e2.pdfIn PDF document text
    • http://kewujedirolut.22web.org/rutivopowodibedonu.pdfIn PDF document text
    • http://urolog.xyz/60810698020ho3w4.pdfIn PDF document text
    • http://bobiruropiles.22web.org/17363811638.pdfIn PDF document text
    • http://virnet77.ru/imperative_form_inglestn3kb.pdfIn PDF document text
    • http://hiziryigit.online/icewind_dale_2_enhanced_edition_review1id3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/221909fe-b80f-41e4-9029-0663421fde8d/2012_mercury_9.9_4_stroke_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6663439-6871-4e5f-99b6-e76ca0e0ca08/sibala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063ce1da-5d7d-45ad-9a44-7881f0a10dac/doro_7050_cell_phone_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0998d967-7d19-4d63-b87d-69e35c48975a/subevog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71bd706e-bc3c-4eb9-a8dc-c8a969b69a85/siloderug.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_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5492 bytes
SHA-256: 41b14c0dfc59d39a8f7256f697f059b8ea36b3be559c2098bc2b70fd902d1708
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 9896 bytes
SHA-256: d99ed7222089e4a8417223c664909afa68dd23ff7482cdf48f7b690f4eaa34a1