Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9b80d671862f61…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 09:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5931d99b1910d5ee640bc5c324c339a3 SHA-1: c7d4403165e34acdee9249ead14127f2b62c6885 SHA-256: ea9b80d671862f61824ff78ca110529011cbe7ff83610a1702d89759739b37e7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting it's part of a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=fotos+von+android+auf+pc+kopieren PDF link annotation
    • http://nikkenj.com/userfiles/file/22587412471.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/ronevurumakalewil.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/letuwuruto.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/nixusojig.pdfIn PDF document text
    • http://maidichike.com/upload/files/64407511416.pdfIn PDF document text
    • http://reylab.com/userfiles/file/welinozezafinimejor.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/segejologajanosavoza.pdfIn PDF document text
    • http://xfswchem.com/upload/files/viluxatiwepane.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fff8bf601b1a2cc023b552422363ec5f/wafimerijifukilanomaniti.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/86243624619.pdfIn PDF document text
    • https://europartner2.pl/uploads/68727570906.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/rizuwi.pdfIn PDF document text
    • http://trevorhannant.com/263395589.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/19664104646.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea1283adf---61050808889.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/selogonuwunejibaluliluwep.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/todozudepekokugoso.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210911141055.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/43602913445.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gazisetapaxetobe.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/basibopugizumuwajatog.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/kajonigefoden.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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 10804 bytes
SHA-256: db573821f29adc0fb1a769e67f39f90e76d5604cb2392ae2f86043f614db571b
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 20300 bytes
SHA-256: 5f155ce00d4cf8aae439aba98b1a0468375a2816ca8db2d6470946fc5fd3e70e
font_02_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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