Malicious PDF — malware analysis report

Static analysis result for SHA-256 50633c6794c6737d…

MALICIOUS

PDF

77.3 KB Created: 2021-06-05 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f59a5303849aed0623bf53d42c7be223 SHA-1: e5a0ecddb983f8851697d8747388cd7368bce32e SHA-256: 50633c6794c6737d0812fb4530893d0b71b53ff73a134db84552552aaf519563
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous embedded URLs, many pointing to disposable hosting, suggests a link farm designed to obscure the ultimate destination. The ML classifier output of 0.999124 further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/123?utm_term=divine+names+dionysius+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fde3b482cec2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5fcabfe060f71.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/5419498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_601547dacaf7b.pdfIn PDF document text
    • https://viborune.weebly.com/uploads/1/3/4/5/134592701/bonagaxefowonaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_60198233dc201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406170/normal_606505526f4aa.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/kopijaxobe.pdfIn PDF document text
    • https://nudoguku.weebly.com/uploads/1/3/5/3/135306062/kebuvul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_60b82e0d8333b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6042ee3255e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6062d3a6abf5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144629961/always_kabhi_kabhi_full_movie_online_filmywap.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/how_to_learn_arabic_online_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61dff57-60cc-40a9-88f0-ead46ef20cdf/difadodekevas.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/spacerail_level_5.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/difference_between_concrete_and_abstract_nouns_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe9a715-2a09-49d0-ae8a-35575e336853/30981339999.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/how_to_write_an_essay_about_an_event.pdfIn PDF document text
    • http://zuwofig.pbworks.com/f/23816855741.pdfIn PDF document text
    • http://lalunanefiw.pbworks.com/f/how_many_stories_are_in_scary_stories_to_tell_in_the_dark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b18de39-c5bd-4a24-8481-c1fadd6e0bfa/92896671922.pdfIn PDF document text
    • http://zejokij.pbworks.com/f/risimasuveg.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/wevixedafesokav.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_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 5220 bytes
SHA-256: 147b950fb09d3312ed573295330cf6f444eb7ce77f7caa4b3d79b7d623d5f7ea
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 11824 bytes
SHA-256: 43a9e94bfa80e62669fd33360416073d9637bbe6ce1ae4337c19a2f6183bbde0