Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a5c544cd76c74…

MALICIOUS

PDF

92.1 KB Created: 2021-06-05 05:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 26deb80a22420f0055798e1a44a07d89 SHA-1: af5ae3ab064285286ea2af518c952cc4d4668b8e SHA-256: ff0a5c544cd76c74bc512a6e03231c82e5c233407b642afd87f119be1a199467
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 0.9993

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://philabc.ru/pbw?utm_term=zenon+de+citio+libros+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415767/normal_5fc85e45ed989.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/439944067fd146b.pdfIn PDF document text
    • https://sutudaxete.weebly.com/uploads/1/3/4/4/134497902/47d177855804867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_60450ef06838e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_6052c21ee7e4c.pdfIn PDF document text
    • https://memumijakularaj.weebly.com/uploads/1/3/4/5/134507661/gozodanakigi-jezitod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fce795eacdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_601011f16be62.pdfIn PDF document text
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/futozimunuli-xutivakabunef-maxaw-zaxesem.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/6b1b3ded-f541-4739-9b22-bf3c34298ab4/dixug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffdf129-3af2-4522-94f7-901a0b7603ca/what_is_the_main_theme_in_animal_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3c44a4-302c-4695-a6bd-5838cd156541/singer_promise_1409_foot_pedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95a7d79-1a8b-43af-8bed-6fc7b0b1c08f/fl_studio_20_producer_edition_free_reddit.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144566091/conjunctions_worksheet_for_class_3rd.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144512418/tegeleran.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422991/bahubali_3_movie_download_in_hindi_hd_720p.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144473727/jepozusuvufabadito.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144528492/kodi_no_limits_2019_for_firestick.pdfIn PDF document text
    • http://zikasamu.pbworks.com/w/file/fetch/144460461/molijikugewemupezu.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144582774/how_do_i_cite_a_quote_in_mla.pdfIn PDF document text
    • http://serizedez.pbworks.com/w/file/fetch/144598632/10632204169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebeb948c-1660-4a1a-8507-9deef7cc3940/jejizerubovagabu.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/english_vocabulary_quizzes.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_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 5036 bytes
SHA-256: 393ad283b09dfd497999b3a977622f83f4f4462512f29f086133888ad58d83bf
font_01_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 20208 bytes
SHA-256: 14f543bf0c4bce1b0378f8c4bdec5d4e260636a2069111b63a889e8fd24c6202