Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad596431cff9b00d…

MALICIOUS

PDF

71.0 KB Created: 2021-04-05 04:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0722f1b41df18f812c2c60964a1476bc SHA-1: 687bd28c22e23a462a4f4eeb0585020bb7d85541 SHA-256: ad596431cff9b00dfa2d547b7f3531a0a7fb6692490a359fdb3604ebe71ba9ab
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'utm_term' parameters in some URLs indicates tracking or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=facebook+auto+liker+app++uptodown PDF link annotation
    • http://temezisabekazev.iblogger.org/languageguide_org_spanish_alphabet.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/how_old_is_rl_stine_now.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/5964037.pdfIn PDF document text
    • http://verification-help.com/business_law_clarkson5fe3i.pdfIn PDF document text
    • http://help-verification.com/how_to_deal_with_an_emotionally_abusive_momkon0q.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/8551497.pdfIn PDF document text
    • http://gosezan.22web.org/5402701351.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/comment_amliorer_sa_concentration_exercices.pdfIn PDF document text
    • http://probmake12.xyz/koluwumedowuxolubn44gr.pdfIn PDF document text
    • http://viwimewi.22web.org/benecard_prior_authorization_form.pdfIn PDF document text
    • http://nilutafejo.mypressonline.com/22163269506.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/840651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patudesaruvob.atwebpages.com/best_free_english_french_dictionary_apps.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/budasesibaf.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/nekelikuzofarujofezudiz.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/bokofoxujani.pdfIn PDF document text
    • http://tifatorebuvu.epizy.com/kabir_singh_movie_all_song_wapking.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 5140 bytes
SHA-256: 0cc42cd04ad08c75ae9106b7d0c6a2ccea8a4015fcc567bae388fc7354cc18c8
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 14344 bytes
SHA-256: b7d1bf0e9d448895defbabd01b216e4070e6c87f21c708863f7cc5a3e7bc727c

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