Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b420c6b22e91a8…

MALICIOUS

PDF

81.1 KB Created: 2021-03-03 17:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: adbf0f61112914470bad865ff02cf208 SHA-1: 25b509ecd19ac209e9226b490de35026c337987f SHA-256: 25b420c6b22e91a80053eefe926dccd41623182531666e59c8cbf5f7ba9b2e86
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/123?utm_term=ap+style+for+quotes PDF link annotation
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/bopebuw_bavipam.pdfIn PDF document text
    • http://netlysy.online/zasadabzce1.pdfIn PDF document text
    • http://ipatovaalena.ru/ainu_last_namesub6sd.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/1e3e586b2c0.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/1864076.pdfIn PDF document text
    • http://extraterrestrials.space/free_download_harry_potter_full_movi0uuqg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_602a28aae2ac3.pdfIn PDF document text
    • https://damaxebibotewud.weebly.com/uploads/1/3/2/6/132682848/9c51dc417d9.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/lotilode-kasiliroxumewos-damisuwoda-rogeparowa.pdfIn PDF document text
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/6521185.pdfIn PDF document text
    • http://roman-holidays.shop/complaint_letter_template_housing_association4taiv.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/limukal_bidunozileder.pdfIn PDF document text
    • http://shtangye.xyz/57084198758n6y4f.pdfIn PDF document text
    • http://profaudit32.ru/how_to_use_mendeley_to_create_reference_listd7mrz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5feda16536d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_602c35b51a668.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/cakXhdg/54406759203.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
    • 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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 4632 bytes
SHA-256: 00ddaf884b22a17d119370b3e4723b9a24e176a91f3bdff3d4a8d7bab0b763ff
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 10600 bytes
SHA-256: 7e61bc55646170fa8d196287c56b9573ee6f5bcba126b5f75b0a5b2b0ed97392
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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