Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca410cc9c17ccf8…

MALICIOUS

PDF

76.2 KB Created: 2021-05-18 15:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b4b91b5961eb447fb22145aa5f2fd0f2 SHA-1: 5c1ecf23ab280b9686228e9bfe287ff26d1dfee6 SHA-256: aca410cc9c17ccf866718827e1552592e32584e4b10f0a60427805c63bf6c7ba
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=random+shot+drink+generator PDF link annotation
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/waxinofomovubase.pdfIn PDF document text
    • https://zadisoro.weebly.com/uploads/1/3/4/5/134525292/kurija.pdfIn PDF document text
    • https://nubiduxabegi.weebly.com/uploads/1/3/1/8/131871606/piradam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_605185a765527.pdfIn PDF document text
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/saxazewimavow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_605d82e674be4.pdfIn PDF document text
    • http://woravesamoz.22web.org/sevaxuburuzovonosozugasim.pdfIn PDF document text
    • https://sejirefado.weebly.com/uploads/1/3/4/6/134682993/03cae432.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/6426504.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/9a7aaef5-9338-419f-a0ca-83bbe61654d9/kagakebubawex.pdfIn PDF document text
    • http://siberasule.rf.gd/62031219827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1632b763-e477-4c99-9ad9-e5d175516241/libro_de_geografia_5_grado_2019_contestado_pag_51.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca12a8c-a194-4bf1-b3f6-7b33ff77b4eb/kali_linux_nethunter_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8ae2f2-25be-43a0-8863-53ae58a9ec73/nusig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fbd813-2dd1-48f0-98cc-0ac3136cd38f/adobe_premiere_elements_free_trial_limitations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60cce262-70d9-45cd-bc25-db6fa4c4bc7b/19015020756.pdfIn PDF document text
    • http://sujekafejawojav.rf.gd/jobal.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/23411881162.pdfIn PDF document text
    • http://datasixiva.epizy.com/coreldraw_x4_portable_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08087f53-3866-48f0-855f-8014c0675a06/kuzuwewajag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c318c8d-6650-47d0-98a6-578805a2850c/how_to_pay_off_debt_management_plan.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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 5280 bytes
SHA-256: f9e1f5f70a4c70e649ef66abf78e3a000e091eec67b0da5ff15eeb58a8d56d39
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10932 bytes
SHA-256: 1de286572609780979f71d1aa359a06183dcc81397656da19b1a2d28b1f7e18f