Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fc7216a5e271cd…

MALICIOUS

PDF

81.5 KB Created: 2021-04-25 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8adfbeeb4023d6991f7d285f55222718 SHA-1: 978f5649c34025091d7889b9082524421521ee3e SHA-256: a0fc7216a5e271cd9d77c6f082174f7b89c0122d9bf0990587f230dc64a1807c
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 embedded within the document body, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+read+periodic+table+element PDF link annotation
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/bopifevoju.pdfIn PDF document text
    • http://topfrag.rip/sosokofadau3baw.pdfIn PDF document text
    • http://naturka.space/stock_market_breaking_news_twitterkvg22.pdfIn PDF document text
    • http://epaytds.xyz/stihl_039_chainsaw_parts_manual60crw.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/56492009998.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/3f6902685e709.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/segola.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/zemojiferera.pdfIn PDF document text
    • http://storedubai.shop/63267587660wdzwo.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/viregujipowuru/mixivetonivuxosobutip.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/kawafunuwipokemita.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/buxeriwuwuzif.pdfIn PDF document text
    • http://limufij.myartsonline.com/zipumozejiz.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/32344554767.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/zemumexudawogapatojopena.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/galilavuraro.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/rirazowopatugusoxifasul.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/13886989731.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/internet_of_things_security.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/51142618644.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_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 5232 bytes
SHA-256: 6b24d170edcd7e84e899e84359cc79a9810a271614a7a0b3c392b0beb1e177db
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10012 bytes
SHA-256: ba8b2da50f19986cd44e9b319a14b6d44de64d6c87ab0f837e784dbcfde5068f
font_02_sfnt_off000123a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A7 16104 bytes
SHA-256: e01b5ded4d3a1dd377799f18dee16aba5ba3cfe41915a866d8d922779bc4fe53

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