Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b5d55e21524c85…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 88671592d34fc0798086901d80b048af SHA-1: 67aeb5c93bb2fc05495e8e0f7c0916137ae307c4 SHA-256: 51b5d55e21524c85398f780b81b62f21be83a1d2794ade47ac1d2f56bbaa624c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://serka.com/serka/upload/files/67052753983.pdf In PDF document text
    • https://506hlapeta.com/files/file/55028708955.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wuxumojubuje.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowisotifegotuzolep.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wuxegatemekofagofo.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/17502285827.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901161215568.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/74619215325.pdfIn PDF document text
    • http://lobi.md/userfiles/file/tosaxuluzelewuj.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/59181850724.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/39942146399.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/53938263843.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/depixovuvowawategulafirik.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/daxesexogakarupijalijub.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sidupa.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/gazaramidijulodiseriwem.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/lezarovopudoderopafisopus.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/98311827846.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/55136755570.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109060803023041.pdfIn PDF document text
    • http://chengzechem.com/upload/files/kefaguratilurirulunanol.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sokokinimalakipomuduneze.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/gobesito.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_306710C3C25570B7.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=live+soccer+tv+freePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 17704 bytes
SHA-256: 977dfa9047db85a0361e85efde5b89ce37b14b9dd4d652c3548a54c8d5b6e826
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 10040 bytes
SHA-256: df76b712c0f30e2ec8b356107a7edb73a250ae02567c7e707451e07c01476581

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