Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d23732ea7a6bd11…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 19:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7021bce944e3ac0df92f9dab5aa1d967 SHA-1: f45e7a5f8a783ad1707788666a292b24472ebd4b SHA-256: 2d23732ea7a6bd111b8289a5a5909b8d65ee715bfbe307fe9c2ae22babee8fcf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external URIs pointing to a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=sybertv+free+download PDF link annotation
    • https://estoniapools.com/contents/files/puluzefatazugajutenofel.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/guvimubanilufi.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/30835538635.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-11/20210911201617628852.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613067f7266b7---54033980076.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/32677272718.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/29520489132.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/25602823923.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/43033350626.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630731979.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a41a2b931ad286b1b506f1d001c5b182/76305279788.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/tuwawarufab.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/tiwotusufuraliv.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/51104052515.pdfIn PDF document text
    • http://hrudolf.com/userfiles/70582028885.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/93310008730.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/zesolofupulabajefej.pdfIn PDF document text
    • http://104408017.linker.tw/files/sazatevijuzono.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/mizeteluke.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fofagiribib.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/29873099471.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/12952798437.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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 10568 bytes
SHA-256: fc6619a7f1ff5ae6f7742930cfde0212ea9fc2be3c20c4f127d794155161c143
font_01_sfnt_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 15444 bytes
SHA-256: 98b63a8d2a740407664fb6398e86ba42441085fcd51e54219d16ed4a90fc0120
font_02_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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