Malicious PDF — malware analysis report

Static analysis result for SHA-256 4454b8db8080893c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 17:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2a6166e67fe393ddb3d130a683772615 SHA-1: ede78cc3307d4dc2ea671ed743a98bc95318d2d8 SHA-256: 4454b8db8080893c312874fb40217b3abe85c254d4228c53a32e0d2632f7ffdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=how+to+remove+default+apps+in+android PDF link annotation
    • http://terezmisszio.eu/files/file/xezifizigegorifi.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/tasinapixavew.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/8640834664.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vesasuvuxebegajikanelo.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zofali.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/lilevupetelo.pdfIn PDF document text
    • http://zeci.nl/im/image/jejokawego.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0a60491aed655badf4afaba0ef1a2ab/fosuzi.pdfIn PDF document text
    • https://tcremich.lu/files/files/buvelu.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/jijugafidaladizoj.pdfIn PDF document text
    • https://parkettworld.com/upload/files/30965587700.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/rutarix.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/63540510332.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/48634182957.pdfIn PDF document text
    • http://surestegc.org/documentos/file/69196037810.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/92263391697.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/ranuwalokenarajomikub.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/raxemufegoledoni.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kokusuzugoginotexirow.pdfIn PDF document text
    • http://rinsacars.com/files/others/xodovuvobenokajobitili.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/19810000152.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/fusamilibuwapuzazotaf.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/komobufikare.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_off0000ed97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED97 17388 bytes
SHA-256: 802cf34830867df66f03154079e01ec092821ac987dfbcab7dfd3a69fbccc99f
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10900 bytes
SHA-256: 4f82baaf71b63374c734df26a51c85301fbec83cec41cc2ef04db687b68d0354

Open this report in the interactive analyzer, or submit your own file for analysis.