Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7f6e5172b1dc27…

MALICIOUS

PDF

73.2 KB Created: 2021-03-11 22:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 803ee17291638337a3217c27ccc728c7 SHA-1: 3ae4abd18a300a1dec3cf4d3150b1e7762ff53bc SHA-256: 5a7f6e5172b1dc279cf3a173f7e35a18ffa85343937148ec5363aadd83f9cdc2
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded URLs, with one prominent URL pointing to a domain associated with phishing activities. The document body, though heavily obfuscated, suggests a lure related to 'seismic structures' and includes metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=seismic+structures+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5fd981690cefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5fd12eef431a3.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/c5ae514092fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_6031b6d3cf579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_5fe62f7357170.pdfIn PDF document text
    • https://nalagaruzu.weebly.com/uploads/1/3/3/9/133997435/zolaletitog.pdfIn PDF document text
    • http://usmileofficial.site/sekuwoware3ldf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_6015a541823e9.pdfIn PDF document text
    • http://ketotreno.buzz/27315232369apo9s.pdfIn PDF document text
    • http://roflan.site/883486765692sc6i.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/f5b3b6e826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8f2b6ff0387347518e8e291476adcccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/following_directions_maps_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ce2fab-ae2e-4568-a84c-59e0d0e3d656/dunkin_donuts_breakfast_bowl_nutrition_facts.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_afcbb30555de45cf98c6d59e5be6fcba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db57fd58-ad50-422e-a23f-8186c8bde122/23071648607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd4f7af-c263-4c84-b14c-33afebcbe27c/delta_adley_crib_instructions.pdfIn PDF document text
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_e82b8930e2224c1bbde2fb30d03c5518.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de1c4a2-18b3-463f-bf04-ede698e47be1/84762147416.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/antimicrobial_activity_of_copper_nanoparticles.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/navovakopevepatamavoro.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_7bb68185f30a4d94b18e677fc28fdf4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b401d86c-d0f2-4f99-ae2a-70f053b25a86/68372824373.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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 5160 bytes
SHA-256: 1b625aff870dcaeb575790e4232eb4cf80f4300e19b6afb70eb76102050d0625
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10152 bytes
SHA-256: 4415cd41733ef4afc0faeb327e355ae23cc4a54cf929d59bd1870f65a9f1262f