Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4df8c98bb921a9b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 16:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cdf9d8236035a5ecf6a01535099be382 SHA-1: e6aba3c78163233d1f10c83e25514a56fdbd76d1 SHA-256: b4df8c98bb921a9b71e59e6e4ea89a525099b69ef0ae40282231e0c1f0c1ee4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, and the presence of URLs like 'https://irlanc.ru/uplcv?utm_term=download+and+install+apk' suggests a lure to download potentially malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=download+and+install+apk PDF link annotation
    • http://poketomecam.com/uploads/files/35037255624.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sowobetudes.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909100616.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/53572859121.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/podotolifivonunoj.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/pugamubami.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404344d3b43---38316144876.pdfIn PDF document text
    • http://honghuibio.com/d/files/31612361222.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bapiv.pdfIn PDF document text
    • http://deauville.ru/files/file/76186200730.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c41fff538567b1ba5f6dd10b663bf72a/wotebetumamadora.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91956050915.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/76282365512.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/dolugox.pdfIn PDF document text
    • https://jjpremiers.com/files/71457160170.pdfIn PDF document text
    • http://e-sheremet.com/img/78675708892.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/xanorefakebesedid.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/lojomi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/42376416624.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/wotijiriva.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/90641604425.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tiwarapufe.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/88572164928.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/47434734463.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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 10332 bytes
SHA-256: c5f00520f3cc3dead160c252808e8ffdfd309bc95fb41e7e6e798d9ac8a310d5
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 17312 bytes
SHA-256: 002389e25ea27483fe3473e466b345cd193d790312d30ff0d8bd10199900ce8e

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