Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e834becae0ba470…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 00:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae31bf14e4449b0c21bf276d1499b652 SHA-1: 60c7b703f2f0d20b1a5122f5df8bbcef472cec62 SHA-256: 1e834becae0ba47008dbabda7553ff19b83632eb1d431fd66a61564e77bc419c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and containing 'utm_term' parameters, suggests a phishing or link-farming operation. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=how+to+get+free+robux+easy+way PDF link annotation
    • https://malashealthcare.com/userfiles/files/biruzageloroneguvu.pdfIn PDF document text
    • http://classtool.info/upload/files/gapuvojolidatemaporiwumal.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/85541087426.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/94989728456.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/tiledadupuwimopef.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210915200503.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/45482538288.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210913_9B1327894A5DAF32.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lopikapanumenuxolimigev.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/pelikepupidazojadofazufo.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/52289215686.pdfIn PDF document text
    • https://triosms.com/userfiles/file/41344814082.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/37992196519.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/74982775921.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/35430114220.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090503194423.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sawulesowekakugebiw.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/19250207729.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/jozipekotit.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/uruvo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/53513783600.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/damikovozojebugexukawi.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/47464267853.pdfIn PDF document text
    • http://vce34.ru/attachments/file/movuvosokumer.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_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10680 bytes
SHA-256: 5fc91b9026c376efd9c880b5923e9354c8e0f559c42ab48465c95e0ce4b34476
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 17056 bytes
SHA-256: b54e31ca7d6886642317c4e784ed605e4ebdac73e2b9c907c1bb7b6c5f043cdb

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