Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c515848e978890…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 00:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ed5394221bad98d6b110019f8b241c0 SHA-1: 64c160e9b5e4ebd68601bcf2945321bfdd7e3042 SHA-256: c0c515848e978890cd3a30cb9397eb26a42fb7033f9ca4a3fdb70124314b3e03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=spotify+download+mp3+android+app PDF link annotation
    • https://ipekyolumedya.com/resim_galeri/file/xoberiwupugegix.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20321eb09---94321398037.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/27338090436.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9a2cef06---55337456020.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/liwivetusi.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/13181922566131abccdc611.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/zutuxiwawekerin.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912050915.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/roximoburawedorufe.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/soxotudupujilolipabufat.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/34712132057.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/musizatekorasut.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/zogomaruvemobevojewuvi.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/rotorazopujadapo.pdfIn PDF document text
    • http://wohingltd.com/userfiles/68319367281.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109042236016246.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/88513568262.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/11513105747.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/todirabojimalovatawewole.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/77734403653.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908133711.pdfIn PDF document text
    • http://mebco.ru/images/file/69359959671.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/75712739662.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/47584860945.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/deginanoranijuliji.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_off0000baa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B5 16616 bytes
SHA-256: 1cf3138f2e5bc78fb630dbde5fc1d8986781cd946b51936823cc4df535e10dac
font_02_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 10804 bytes
SHA-256: aa16beb9dec9677f49f2784e6f48317ba520d03fa2434f6cd201b3a6b697601c