Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28a09c942bd940c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-16 08:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7973b1bc6b94c6933408823a7162f242 SHA-1: e3d1a015305703e12dab1cd770e14e4329a2619f SHA-256: f28a09c942bd940c4e5db0f6cd8e1a48191f21a5d4ff8754216f6d732f8b697e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, 'https://xezojetit.ru/123?utm_term=holt+mcdougal+physics+answers', is likely part of this scheme, attempting to lure users with a false promise of physics answers. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=holt+mcdougal+physics+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380699/normal_603479096290e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5ff8b39f73164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_60480339b849c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5fcef9a71af79.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/gihbV74/8312437118.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/jb4RhjT/modern_simple_cv_template_word_free.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/4a9305bf-2985-4daa-9ff4-f9993ac7b75d/9041584332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d092c4-da55-42c7-8c6f-7da55460afac/windows_server_2012_unleashed_by_sams_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b2cfe2-b074-41fc-bc7e-82ce37583331/32570349682.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_7ac35e1c906f4ecf97fcc4837a2dbd26.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_654211bf753446ceae5c47c1e0e8e245.pdf?index=trueIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_9f3186d5254e4ef1b62ff614c22c820c.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_b7e91a583857423d8f11eab80a5a2d15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/customer_journey_analysis_template.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_ea1ce044c4a44337821691f1b4d7aaab.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8f0eed0dbae24594ac26547c407349f1.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_8bdf39d0edaa4fa48599362e98e76df6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/53296923207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc257499-81a5-4424-ab02-facc3ecf5c3c/que_significa_no_temas_en_la_biblia.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_e010063bdbe745c9abebe19dc7275c80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numunenoji/how_to_find_surface_area_of_right_rectangular_prism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad37b29-e611-454a-a788-0c13e1d2fcd8/the_bluest_eye_film.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/nasarenolewos.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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 5644 bytes
SHA-256: 697ef4f429ff60c70378e9f2818e4fb153dc501abde410e16ecbcd2fdaeaddcb
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11300 bytes
SHA-256: a825060f34e79a73c8a239315f9b1136cf142a44a6c426a4319550a982121036

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