Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5d0b492f40d7ed…

MALICIOUS

PDF

72.6 KB Created: 2021-06-03 02:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d729880b2af471b83777d635bd1315b3 SHA-1: 120bf5fdb285474e3ec83ea982ea5e45bd61a8f7 SHA-256: 4e5d0b492f40d7ed87e52302fe9742547f87e7dd7f8d0d766e37bf5052a2a74f
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 phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a technical manual, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/pbw?utm_term=solucionario+resistencia+de+materiales+beer+johnston+6ta+edicion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5fd915340edb4.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/f4660e68f09.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/9922044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_601a1b52447ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_600d78f3b9e29.pdfIn PDF document text
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/1819553.pdfIn PDF document text
    • https://vadinako.weebly.com/uploads/1/3/4/8/134893839/taguvitunofudidifedu.pdfIn PDF document text
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/nobototivebo_warol_siweriva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477620/normal_6023d89651988.pdfIn PDF document text
    • https://bewebisiseten.weebly.com/uploads/1/3/0/8/130874130/c71c361f6e.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/sitavonalujibabogo.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/d50ebf75e4.pdfIn PDF document text
    • http://shoxet.com/1afwpyIn 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/5c929f67-6f12-46ed-a4ce-d5849348f862/jutupefaxuxijavo.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144425787/21062573550.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144508857/24262185739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29fb09-4e86-41c2-9cc0-944327367e39/relative_pronouns_english_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb7241f-89db-4887-b0c3-d08120d18c17/how_to_replace_battery_in_roomba_500_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3635c41c-3944-44da-890d-04558f74aba1/viking_refrigerator_replacement_door_shelf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f717d69c-5ea1-47e1-a49d-3a07911f1cbc/when_will_hbo_max_come_to_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65d79c3-d47a-4f41-ab28-922828872ac3/judy_garland_have_yourself_a_merry_little_christmas_lyrics_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86cb458f-8821-40a2-8740-5faa0a27f0d9/wahl_clipper_kit_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa1336f-be70-4af5-bc73-6634f6c84fc7/vasebarifipajinanakul.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/nipomejabatufupezuk.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 5868 bytes
SHA-256: d12a2ef413f5f2a460408f06df217654721d734429fcc52fdd44812e342c89f2
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 11736 bytes
SHA-256: a41c76c9f5c8a6b661be9c426abbb341f146ce17c642b17753c7e74e937e275d

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