Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bea04e72d968e1f…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 08:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc6efb7a730747ea00c65a929d56f5cc SHA-1: 7451acae2fe729cc50ef3e7cc058d7072d92ca20 SHA-256: 4bea04e72d968e1ff8fc0cabcd2eee5b057fa9c40248444c76ee88b0da1bcce9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=tl-wpa4220+v4+firmware+download PDF link annotation
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/4576124.pdfIn PDF document text
    • https://molusodufewi.weebly.com/uploads/1/3/4/4/134465793/siwologurifagelak.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/zuxetovo.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/negegi.pdfIn PDF document text
    • https://tazapupexon.weebly.com/uploads/1/3/4/6/134634001/f1ceca941.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/infosphere_data_architect.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/xunilukegez/18240574194.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/wefovetatezemozune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734fdea9-6b4d-4c78-bb1b-fae3af166dbc/dujinugadakupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2422c68c-482d-4340-8021-d01f69811ef6/forejugitira.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/nosojotomixiwenedetijij.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/aprilaire_thermostat_8444_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/1681836456.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/1994_yamaha_moto_4_350_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/game_of_thrones_sheet_music_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/jeril.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/78729447504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/335665d2-3870-4e35-b608-fcb2d783d640/selunujixopefiwevu.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/the_girl_in_the_spiders_web_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3383b47-1f36-4c73-9f42-57dc23095168/82831170676.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 2996 bytes
SHA-256: cc818ed9a62ae2b794c5d06e5d452725d30f412bee07a7203a6ca420bb733cf6
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 5212 bytes
SHA-256: 42bacaaf0e72d8f0ba5d4208cecc6055655e18eaff24d8a83d2d0ab072bef7d3
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 11036 bytes
SHA-256: ca1ff9423c057c2e92d21dbe71ef73f795b509150111a28af2d4778c61b032f2
font_03_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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