Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf4c9b16b9681fd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-12 03:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75c0c77f774c59aa3e17e85fc7a54dad SHA-1: d099d74a1fad7b84d792d3e375a1a7fca88d3ebe SHA-256: 9bf4c9b16b9681fd216cc3feb5469f71d9eeeeb3dce58e87e37d7c14b98fb255
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://catamma.ru/uplcv?utm_term=jojo%27s+fashion+show+free+download+for+android PDF link annotation
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/79837590107.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/wupok.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/gerufarawimawozunoxor.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/kawikesuwo.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/liruzarumo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zanaki.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/24943508915.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/jeladibedawesitaluxesag.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/68914964029.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/89431547872.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/lepevufivu.pdfIn PDF document text
    • http://vlajamo.cz/images/file/24534363937.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/70020543127.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/zupujuxedabiridufitolu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bagaf.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/miposokideloto.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/39771402515.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/lolaxomuviri.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/pudogoralizunetedorapox.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/kuvuzunufuwojuvivose.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/wukizudot.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/losenazugeruzebivezakejav.pdfIn PDF document text
    • http://abnicum.com/files/file/19528300434.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909041956212208.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/45544637120.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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 18480 bytes
SHA-256: af3eb842b170291194726f29040aa7950dc8dea5a8cc326046175da56247e729
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 10592 bytes
SHA-256: af4062d384f46a2ca72b7fbdb94acc624c47455eb3384c65d3ca3dd3367769a2