Malicious PDF — malware analysis report

Static analysis result for SHA-256 b809ab49d1aba732…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 16:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e784bf1cdc150c9e6dbf35d44ea05a24 SHA-1: c617d7fd8f74faf614e4a33289c4091534fe88d9 SHA-256: b809ab49d1aba73255c93b2cdc36722e70ea79228d52f010b2ce30d126717ad7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. While no scripts were directly extracted, the presence of external links suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=american+english+file+3b+second+edition+pdf PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ur25h4mclj52blm601k0n10m3i/pafexeriju.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/51962777927.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/kuledikowuti.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/35745048238.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/pivazituzeketalov.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/69238210650.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/80870093690.pdfIn PDF document text
    • http://dalaichau.com/files/72852032777.pdfIn PDF document text
    • https://limsurdua.com/contents/files/23906735090.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/xosiludibeboximomum.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/35296285346.pdfIn PDF document text
    • https://mangallagn.com/images/file/xuladafet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613908f156ffe---59816486488.pdfIn PDF document text
    • https://tckontrola.hr/files/liropunamonumawu.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/62099915035.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/netizabel.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/jovamokogudeva.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/89849179889.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/26118019886.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/82523412537.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/nemapujimarutebezezedozis.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/37592761998.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vafifexaguxidozepi.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/figelibozilejefes.pdfIn PDF document text
    • http://partnercable.hu/files/21397165084.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_off0000be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 11360 bytes
SHA-256: 0336ef1f222fc27aab4314843c0d20e00a35767824e710c40b2324df15566014
font_02_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 18568 bytes
SHA-256: 81240eb08e5647715fb1ea4f81c7aa4209e1ae92f87cb09d424a14de6dae95b3

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