Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbc60aa65302790…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 05:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1316a3901c46d25c44a54f5ab8b744ee SHA-1: 7d6dd12fbffb52a1b508d4890f2ed43c95d7afeb SHA-256: ebbc60aa65302790b61cd645d6d549b85f5e98b1d745d42fd1259a1efe9d708c
156 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 of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://botokaw.ru/award?keyword=physiology+of+transplanted+heart+pdf PDF link annotation
    • http://jekenufakewe.mypressonline.com/divibezenafoxifi.pdfIn PDF document text
    • https://xukusoresi.weebly.com/uploads/1/3/4/4/134488105/3992031.pdfIn PDF document text
    • http://meetdouche.xyz/information_retrievalz7j16.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/social_entrepreneurship_examples.pdfIn PDF document text
    • http://noverst.xyz/133914716629zs7s.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://investmag.org/bilosafedusunaifinw.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/xixejibejaxiduwuvo.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/runujevopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/is_a_easy_peasy.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/topology_munkres_solutions_section_30.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/84424327310.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/kpi_template_excel_format.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/64579574550.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/is_1400_a_good_sat_score_for_ucla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a38175-5ea7-4d5b-a529-06f6ec4e740f/ged_math_pretest_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/6th_ed_solution_manual---fundamentals-of-heat-and-mass-transfer.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/kivipesowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4b5836-135f-46ac-8108-1aa07cc4177d/pathfinder_the_half_dead_city.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/free_niv_bible_for_android_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f6c8d3-df16-4bd9-8fcb-3e13a717bdb1/why_does_usps_tracking_says_return_to_sender.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/3997101727.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/histamine_and_antihistamine_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/simple_complex_and_compound_sentences_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5fb0cf-7f02-4526-a8bb-ac30b1993846/baboselesedawifovemabesev.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_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 5408 bytes
SHA-256: 7d11987ac915db8e53393d9a9312440d5bf2b9f2df0096d7a5b17dd621b82305
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 10732 bytes
SHA-256: 7e17030e9e1cc4232947eeecdb3b90bf1f5f852355c0bbcdf20f7dbbd2a0647d

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