Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1d7916c8d8cfba…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 20:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa6e0ea34d8b8442f2ff31f7a5728274 SHA-1: e47a8596a13769553d13126bb1925d7f318d09c3 SHA-256: ad1d7916c8d8cfba69f5466af99296bc19396b19bb34eddf1ee612f35502898f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish for information. The presence of these URLs suggests an attempt to redirect the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=how+to+cast+mobile+to+laptop+in+windows+10 PDF link annotation
    • https://clubelsendero.com/img_pag/file/57811818244.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nefafilekewexapofo.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210907010351.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d785e8855---zetonepofazijizafo.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/nopexe.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zabanamovigudevotirojik.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/46335913060.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/24636819205.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///fidosirupabigozexitufa.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109201702311563.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/20933438653.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/15913435489.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/dufokini.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/bovukutewapivamuzipuropo.pdfIn PDF document text
    • http://itena.si/uporabnik/file/26584446144.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/69014919485.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/286b773e19736895c170db8e25f417dc/74360601066.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/59084539602.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/35191906245.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/terenafovesajofejalamewos.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/77159075754.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://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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 15132 bytes
SHA-256: 6f0d7fa7490012a6ee10032a5820b8dd2687505570622863f5610dc77bf81b1d
font_01_sfnt_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 10964 bytes
SHA-256: 9231b48500113c557f0c49b6ce2200f2e2a2bf38704c8c353561c9a8adfbd75b
font_02_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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