Malicious PDF — malware analysis report

Static analysis result for SHA-256 028985afd3e5bc3a…

MALICIOUS

PDF

81.4 KB Created: 2021-05-12 19:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f4a88aa71da163b152f8520ff3af9db SHA-1: 443709b08ed4a994dd1bfbc193770b28a5d87f27 SHA-256: 028985afd3e5bc3adba61ed3271074d618bb21f25db3eb6f0634d226f43f7abb
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=esl+class+learn+english+speaking+for+beginners+unit+8 In PDF document text
    • http://ketenimolupev.sportsontheweb.net/nazetodimev.pdfIn PDF document text
    • http://mebelintera.ru/7847638963ia6bf.pdfIn PDF document text
    • http://mon-cmbretagne.com/winifiziterisojizeioeq8.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/zojidezuta.pdfIn PDF document text
    • https://cdn.sqhk.co/sisowufabo/mq4hjiS/dino_run_2_cool_math_games.pdfIn PDF document text
    • https://cdn.sqhk.co/pivifilogopa/gdhg7ge/orionids_meteor_shower_2019_us.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/ejebrgi/xomamukarojataguti.pdfIn PDF document text
    • http://baby-slings.ru/933722532686sqn4.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://igcopyrightclient.com/62125668086au3ss.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/gjhi2Im/nfl_football_games_on_local_tv_today.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/fefapevu.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/modern_business_administration_sixth_edition.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/rizezobabub/jidojabamunemebomes.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/wonder_woman_1984_script.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_b6328496bda94a6ba27f1fb8c132cb9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mebozufejif.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/lexus_gx_460_horsepower.pdfIn PDF document text
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_54a30d023ae346fb8aac8798a187d452.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/celestron_astromaster_70eq_telescope_price.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/78335435194.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_15d8ae58527c432abdd1c51086aa52e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorulusof/korikimulubavalamuzaz.pdfIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/lamiwusipu.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/bcd_to_binary_conversion_in_8085.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_264d014dc9e542bfa9a2ccaaa17e2e8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/model_test_3_reading_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 5632 bytes
SHA-256: e63aed821cd76bcf4377555d01fce9244edb163c17f134f958ad128ef09027ee
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10180 bytes
SHA-256: cb4b4e0729fba391af9e646fa8e89b879c9e0d539be4b4a3891a144dbc668455
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 17112 bytes
SHA-256: 20592f50d76d74ae95aabfd4a3a378359b324a2f9b6dd5e316592271d83ae37a