Malicious PDF — malware analysis report

Static analysis result for SHA-256 823c3d914da609a1…

MALICIOUS

PDF

79.6 KB Created: 2021-05-02 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 03fcea939188001890062f62121a426d SHA-1: e69d1ca55f0543e00fe5b09f45170a092badeffe SHA-256: 823c3d914da609a1edf3a09695259c19872a9ab0aa1caaec916f2da42b8a4658
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/strik?utm_term=sta+rite+pool+pump+parts PDF link annotation
    • https://cdn.sqhk.co/daxonotetil/jjgjitn/puvuxuma.pdfIn PDF document text
    • http://zabotokuke.iblogger.org/the_game_pua_book.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/hejhajc/aws_iot_architecture_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/dghBoSP/vizunomurizivedi.pdfIn PDF document text
    • http://beguwidip.scienceontheweb.net/basic_origami_book.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/W6RUjis/91047834464.pdfIn PDF document text
    • https://gebonevoduxap.weebly.com/uploads/1/3/1/6/131606392/fufenasejolekexi.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/xopedasonodig-lixezomeba-widirutonemu.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/how_to_top_up_transmission_fluid_vt_commodore.pdfIn PDF document text
    • https://vakilonote.weebly.com/uploads/1/3/1/3/131382032/205667.pdfIn PDF document text
    • http://jisewuk.22web.org/9911983852.pdfIn PDF document text
    • https://zurejekivob.weebly.com/uploads/1/3/0/8/130813755/1820f.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://gotozowixefe.epizy.com/old_egyptian_symbols_and_meanings.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_846a39a0a06f438bb359da09778cd85f.pdf?index=trueIn PDF document text
    • http://tigufot.rf.gd/brush_lettering_book.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/punepagifuwokigowosi.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_c080c1a1370649bca6cd557819a0999d.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_75f105c0e5494922867725d6dcd61e80.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_c5284ce5cda54ce59f302e0a6d8c7cb6.pdf?index=trueIn PDF document text
    • http://nawezurik.rf.gd/think_central_science_fusion_grade_7.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_bf942fdf566c4a92a0c14fef81a7afbd.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_e01e11291a854d8c9c95bac881443b8c.pdf?index=trueIn 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 4844 bytes
SHA-256: 51072c4affea699bb57ceaf0616902481bb93403fd5076e964bf73a16240275f
font_01_sfnt_off0000fd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 11132 bytes
SHA-256: 32b5ba3cdd63779cb65bcb84c277b6cf409d35938bbf8b8550b162dcc4be6f71
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34