Malicious PDF — malware analysis report

Static analysis result for SHA-256 44361948ed8743ff…

MALICIOUS

PDF

86.9 KB Created: 2021-03-15 21:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 565882217d5a34cbc4d7ccdb7ea443a1 SHA-1: 2799baabc13fdbda53b10d5dd71c5d0bc4242306 SHA-256: 44361948ed8743ffba5a3b4f790fc2a5521e8ef448f7dddde8f303581b5a6f18
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

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
  • 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://maypoin.ru/strik?utm_term=nikon+d5100+manual+flash+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481069/normal_5fd9ba22aa5f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_5fece92003a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_601b27974f566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fe15cbc78343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_6037f591ebe94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_604d2ce67542b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_600748d1d41e7.pdfIn PDF document text
    • http://togurebuk.66ghz.com/83382253640.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/introductory_econometrics_a_modern_approach_5th_edition_data_sets.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/tim_keller_counterfeit_gods.pdfIn PDF document text
    • http://forezofulafenu.iblogger.org/43039060205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rumalitufe.rf.gd/select2_bootstrap_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a62591d4-6f91-4f9c-95b1-623e51673e30/63892241944.pdfIn PDF document text
    • http://wafubarig.epizy.com/neptunia_rebirth_2_endings_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1bbf08b-2c22-48a1-8fd8-8e5bb34b744a/91673668369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53141f1-ddfc-4d56-ab04-a352aed98f96/bhagavad_gita_chapter_16_verse_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3233979d-35d5-45d1-972c-102d256de410/bosubuga.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/destinations_for_international_english_students_passage_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/temafekosomemevuza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 5204 bytes
SHA-256: dfb8aa851e57c35a4469c686cb6678b7552f049a1bbd8dc4920d9e14ac18cf8b
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 11792 bytes
SHA-256: 6882a2265047273ca45409ced2e1ddeb142fb56418cb794943245a8da2be52dd
font_02_sfnt_off0001408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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