Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f30fab1927b628c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 13:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93a6276e50ceca67410e274bd7b1006d SHA-1: 9d9bcbb18c831c73defeec79902964d730a54caf SHA-256: 4f30fab1927b628c46345db6c6fe3e099d0c548f2236a58257aa04fa429d4675
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and the presence of numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://tcihk.com/userfiles/nagixugoriwuwenufoz.pdf In PDF document text
    • http://bassbasement.org/userfiles/file/8714852246.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/bakajirurigu.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/60061322095.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kadidomovu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8cdc71294f46e266e349162a5ee87fd4/60627775425.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gepolopovo.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/paradu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/69543368157.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/kigasizijo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xipuzipotoxosusi.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/6173038552.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7d0c27d13---pexupiz.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/35808356134.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_13_05_45_27_4059.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/jinazubukebaxajun.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/72574298069.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/nasemivejifagenivoxununu.pdfIn PDF document text
    • http://asid.rw/userfiles/file/59316580725.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/14294078404.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210905_61606A97975D0BFE.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/86794880787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=forest+temple+cool+math+gamesPDF 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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16872 bytes
SHA-256: 172857c7b46ebfe6d03fadd061634ae4484a470d493b20a6912162bf4f413856
font_02_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 10600 bytes
SHA-256: 4e0096db4ddbffb8495321a6d10bd660c496cfde2f07d8ab565b204450960240

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