Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a667e63537b98e…

MALICIOUS

PDF

91.4 KB Created: 2021-03-05 13:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2c4d0eca05c958a83dad4deee692ec9f SHA-1: a3bf895b968f1696aade7ab47eb24f96118c4605 SHA-256: e3a667e63537b98ee5f80294d83393057174a6999a95834fec029a91f3bb1e79
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=the+following+is+a+phase+of+mitosis PDF link annotation
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/bepusis-nanupewitabemo.pdfIn PDF document text
    • https://bipuwuvi.weebly.com/uploads/1/3/0/7/130776795/6cb1a925.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/70990651736.pdfIn PDF document text
    • https://kitomejefu.weebly.com/uploads/1/3/4/1/134108571/vupemekozetitimanano.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/1ef4d.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/26695695720.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5e7c509333fbc00.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/air_force_academy_map_colorado_springs.pdfIn PDF document text
    • https://kusawagefeduzuj.weebly.com/uploads/1/3/0/8/130874333/pipowulanibatiz.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/cen_tech_multimeter_92020_manual.pdfIn PDF document text
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/xofobuwigarewi.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
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_2a21baf017d34bc48f8dd70ff3985360.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_e95d05243d2640c59c7bb2f9a883759b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f341793-544f-40fd-884b-8e37ed121f28/que_significa_la_aparicion_de_moretones_en_el_cuerpo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c84a63a-7d85-4577-9c14-2a056192535f/good_questions_to_ask_in_a_sales_job_interview.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_f874e330cd38478fb9fae69a6d2a0432.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/fodmap_foods_to_avoid_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e77e45-6fdb-4613-bd38-5656353221f3/poisson_process_example_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e3742b-bd91-480d-9574-842ba558117e/71020254650.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 5048 bytes
SHA-256: 7d7070c00a7d2f5231aedd099411b2cbba7e060e2d65bdfd5c19dce19fc842c1
font_01_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 10916 bytes
SHA-256: b0186ed1db9ae805be76134a53304931c0d57ef137a6433cc89f8865c4cb2dba
font_02_sfnt_off00015235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15235 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2