Malicious PDF — malware analysis report

Static analysis result for SHA-256 35803ef0b988aa09…

MALICIOUS

PDF

74.8 KB Created: 2021-03-17 21:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4ebbd555a546d42a3370cfa481881c7 SHA-1: 163bb8562b18b101fe7e0416485f1ae94db52dd7 SHA-256: 35803ef0b988aa0965cf0e322de7e38d2dae40fabe2d82c4448dcfb84f5ec6e6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/wix?keyword=party+in+my+dorm+hack+mod PDF link annotation
    • https://cdn.sqhk.co/xuwifoviwalo/idyQWid/ice_climbers_desync.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/hbGQVge/lenosafapekajexorun.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/vekapenisujipawagoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/hYji0TR/dragon_ball_super_devolution_hacked_arcade_games.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/1339174.pdfIn PDF document text
    • https://dorafidugazeler.weebly.com/uploads/1/3/4/3/134331460/padovegag.pdfIn PDF document text
    • https://rogixatig.weebly.com/uploads/1/3/5/3/135323026/tobanu-mavadumivun.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/jgjcghe/ragim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_fc0b549076b44ad0a43abaa993b1f6e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zurovajij/35884555090.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/carolan_s_dream_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a3520f-6057-41fe-997a-fe3ce86bdf54/data_structures_and_algorithms_in_c_goodrich_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/wogosofimabuxajozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6895b68-bbcd-40cb-8cf8-6b68f125438f/how_to_use_a_vivitar_camera.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_fd8a6c4191514a499ff553b53ca0eb55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6035ecaa-377f-4d43-92f8-733be495efd3/63806116012.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/brain_waves_pro_binaural_beats_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a90283-adb2-4183-b356-88b882782490/what_is_probability_theory_in_machine_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/new_fairy_tales_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d540ff92-3ba2-46c2-b096-adb03e553713/82046875294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16819b2-1035-4bfd-a2c0-b6ad65241063/jejufefuda.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_4a72ae229cbf474c8b0d3ae4627d2d1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c65a839-5836-4aed-8434-c86eea4f77ce/juguxerereliwafojaxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272af6b9-1e87-4887-95a9-77ca105b3303/raxibefuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b94c00-2cee-40ba-a962-2fa1e84a1509/sylvia_plath_the_bell_jar_fig_quote.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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5136 bytes
SHA-256: b291070e7abbed105a5998c2f271e0c6f879cc4795e45e364b80b0269c5479bc
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10608 bytes
SHA-256: 183978ffbdebf9be7225d0b5ca7fe64b09730c6363757686a2593f90465ac3f2