Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efab3f9fbdc2ec5…

MALICIOUS

PDF

77.0 KB Created: 2021-06-09 07:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a1418f2c819017e2a9564e3394b38154 SHA-1: 3dcbfe071c81987920c62c737efa4e8f891928a8 SHA-256: 8efab3f9fbdc2ec5138c12a8f8640f604bb12be7819e5787a2c9e26c58a9325b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection further supports its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/pbw?utm_term=formula+for+ripple+factor+of+half+wave+rectifier PDF link annotation
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/9276459.pdfIn PDF document text
    • https://vawisopikev.weebly.com/uploads/1/3/2/7/132740649/2c2489c9d628c.pdfIn PDF document text
    • https://bifagawu.weebly.com/uploads/1/3/7/5/137512270/robota-zenaluvegod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471240/normal_60247d0facb4c.pdfIn PDF document text
    • https://nexonurobev.weebly.com/uploads/1/3/4/3/134371674/82fb525b0de2b.pdfIn PDF document text
    • https://bugemimeme.weebly.com/uploads/1/3/4/4/134403979/7caa42fb89.pdfIn PDF document text
    • https://mimatetozolo.weebly.com/uploads/1/3/4/7/134707120/68e1a0d900bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_6058618d38df2.pdfIn PDF document text
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/f89ec5e0.pdfIn PDF document text
    • https://kosigejobawazi.weebly.com/uploads/1/3/4/3/134315380/5237992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_602e3267a8905.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/1f72c0ab-c5df-4ba3-aaa9-56c114763c11/poperujuwov.pdfIn PDF document text
    • http://gurilotav.pbworks.com/w/file/fetch/144826329/jozaferedobizedejojemetex.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/75800810324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301166b6-e302-49c9-9364-fa855af717ce/63349607239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51799ca7-fda4-48bc-89b4-61d6d865cc3f/cisco_command_to_show_port_vlan.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/sonipajedudor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f31172c-ea69-43c6-bf4f-11c0cfdbda25/xexisofez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d002e6ea-c29e-48a0-af40-c55cda5a50ed/20295974917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98141b01-4711-402c-980f-cb936c85b24b/54955019199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9af705c-e4c6-46ac-80dd-4495b8758dc2/how_to_practice_financial_modeling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e297a8-dbf9-4e8e-8ce3-2acf1ba741e4/persepolis_book_1_chapter.pdfIn PDF document text
    • http://nipekari.pbworks.com/w/file/fetch/144554802/aster_aweke_new_album_2019_chewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bed4396-9dc5-4dda-a5ee-c50701d033a3/american_politics_today_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dbb72f5-2d78-4b03-9bd0-adc2cc2da230/maze_runner_full_movie_download_in_hindi_filmywap.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 5184 bytes
SHA-256: 1c7b6035d529ede054986640d86b1a8448b7666bf11265c02b6d7d0bb204db36
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 11772 bytes
SHA-256: aabcddcf4bd13189a317bb0baf37c8dae0a0740f19e1e23b95fd4ccc4c7b5b0b