Malicious PDF — malware analysis report

Static analysis result for SHA-256 04160a0d35f496a1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 01:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 358836e129f3229133c1a996e7516dac SHA-1: d45203bf752499d252b0a6bea0cfa5e953bc92ea SHA-256: 04160a0d35f496a1859030a1d5d6a12661f6286c5b0f4ec94be6b873b3f888be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of disposable hosting for link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://myoffice2561.sesao33.net/UserFiles/File/ligevizidofefimudurap.pdf In PDF document text
    • https://dienhoanghean.com/upload/ck/files/76471151217.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/luramog.pdfIn PDF document text
    • http://web5gstore.com/Files/files/6421122150.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/17569984498.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347346ed2dc---66012985108.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tadevumew.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/67558028796.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/70516563182.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/90676628546.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/bosiriwebob.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zimigugetobolor.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mixusumafisoj.pdfIn PDF document text
    • http://rococosofa.com/files/files/bowebujomeza.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/4560897146.pdfIn PDF document text
    • http://synergyproperty.com/images/files/60289767311.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/lomukur.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/13991040115.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/lowiwaruzikewexizo.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/96346069742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+colour+does+orange+and+brown+makePDF 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_off0000d00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11136 bytes
SHA-256: 82d66ca4158a844959cd455dccacf1361a294d059e8ab9e3f63dfa889a6ce368
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 16756 bytes
SHA-256: 4ee99551b460267c1931b72e42c7f5744d2fe96a37e9a23177af14df60d63bf3

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