Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce8f643dbcac8cd…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 22:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f145137e293090b7bd283b739eee886 SHA-1: 82b190e4ae2cd5d1af7a5cffac48cbe652620094 SHA-256: fce8f643dbcac8cd67ea9b153f3c6d369d6e952c89bcbd62923c2efc2bf439d1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ajarnveerapong.com/UserFiles/file/faled.pdf In PDF document text
    • https://palcev.ru/userfiles/file/33170463436.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/wotetis.pdfIn PDF document text
    • http://laduses.nl/image/file/joverarejoxatexiwedexo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/20567131099.pdfIn PDF document text
    • http://tiquital.com/documentos/file/zudikarewokaredepov.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613317ae387eb---47866655852.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/29109047328.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/35654054086.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/57549686744.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/bubijidanatuzuta.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109062229179980.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/37898009472.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_18_53_11_8134.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/63409281361.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/bajojesipusetetaladex.pdfIn PDF document text
    • http://df-2.de/images/daten/file/54687040768.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/fatomosiwumaf.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/3833987074.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/39930922751.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/59238107395.pdfIn PDF document text
    • http://scro.ru/pic/file/91747360404.pdfIn PDF document text
    • http://steinemann-ag.ru/pevapawufakisumobixasapu.pdfIn PDF document text
    • http://classtool.info/upload/files/45710157309.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/60813618894.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/jozosukukulagenevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zero+full+movie+shahrukh+khan+onlinePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 10600 bytes
SHA-256: 6e88bfc1dd71e9ea7cc7b1814af4dc132065028f00938fb6a2809d46324338ab
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 17888 bytes
SHA-256: 731f14cbca0872f8b4b8e8aa63171b0ec7dda02a60b6c17644984a73f12a867f