Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1a858264faeaef…

MALICIOUS

PDF

80.2 KB Created: 2021-04-04 05:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 389c1a4e67b279da4aa74c30e7c55294 SHA-1: 27a9c667ef1eab921f8b03f0538bbdcdc1b82fa0 SHA-256: 7b1a858264faeaefde55ed0a844a87a6c8022312b335222e76a3d00a4c04ef54
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to suspicious domains, suggesting it's part of a link farm designed to redirect users to malicious content or phishing sites. The ClamAV detection further supports its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/award?keyword=carvedilol+vademecum+pdf PDF link annotation
    • http://gipogup.sportsontheweb.net/jbl_flip_3_will_not_turn_off.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/kiran_s_bank_po_reasoning_ability_book.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/gimofojupis.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/55142690980.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/beyond_the_sea_ukulele_chords.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/neurotransmisor_acetilcolina_funcion.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/absurdist_fiction.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://s3.amazonaws.com/bisiku/factorisation_worksheet_for_class_8.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_b03ce44bd7cd4c989fd3bbbdf4b14ab0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/the_bent_twig_isaiah_berlin.pdfIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_8ad6616ef4944a279d26a5fa8a0d9e6c.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/risk_management_strategies_in_business.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/39415448381.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/mozonorale.pdfIn PDF document text
    • http://xusasun.rf.gd/how_to_clean_hot_springs_filters.pdfIn PDF document text
    • http://sodapatuvunivuj.epizy.com/wordscapes_uncrossed_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/79454542776.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_d14204e83b8146b484246d2663dc1515.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_85b6de7de2d44a1caf7035de7ef3c663.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/bobugavumukurusogub.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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 4904 bytes
SHA-256: 91f8bdbb2866d9063c7fd3fab944b8c293a8cf04a3c25a578780be101d956b2a
font_01_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 11532 bytes
SHA-256: 3b04be1a391337d7a0ffcd921bd9a067c733b90dfbb339e9bc4777ea6bd67dc3
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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