Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd55173887924853…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 23:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3421b2c7b220b698633d3cd30047113 SHA-1: a13644ff28e39594b50446f01710fc6f95740f13 SHA-256: dd5517388792485317983e11b0f301805242324416842538a8c59ddb291703c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm with numerous external URLs, many hosted on potentially disposable domains. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically points to the document's structure being designed to host many links, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://thaisomboonautopart.com/userfiles/files/5182655687.pdf In PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/dekederakigerudesexipawi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/negisazevusakogotajumop.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/xiwirowuwanajubibesomu.pdfIn PDF document text
    • http://vning.net/filespath/files/20210906204930.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/mugorumiribumo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/78671785524.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/moxinupifaxivusutufu.pdfIn PDF document text
    • https://togeltop.com/contents/files/84763597675.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/bimegapexasasuvijapadoz.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/81914187293.pdfIn PDF document text
    • https://insp.biz/img/file/68464222289.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3116340f---wijagolitifaroxokux.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/kemir.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/19/file/20210919_073332_130.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/50124976541.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/72305562273.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/mowesivaxipapufujefutuwem.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091802432240.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/redevoju.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/xifiredozedebifisizid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=naruto+ultimate+ninja+3+apkPDF link annotation
    • 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://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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 10716 bytes
SHA-256: f06f76c27b26809036401524ce220ab832374e907924353c2c372048db9df00e
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 18892 bytes
SHA-256: 65bb9ab7450e9b7d0ec895fce91281b698882fe7138fafe4d72b7212cec4ab93

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