Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f24aed27696121…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 18:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e99dd3d0c62fc8febe469a3ba3d87bb3 SHA-1: 9e3a0545ff7da399cd332505509fd4c48e5f8fcb SHA-256: 56f24aed2769612127cae8b73945a4f138ff6133499bc8950adb6dd47da12978
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=decadencia+espa%C3%B1ola+pdf PDF link annotation
    • https://yaofangpeixun.com/upload/files/mapizewiki.pdfIn PDF document text
    • http://change4best.ru/upload/file/32578159500.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/lazelevisavepurojerek.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210907102757.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/64172511433.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/54502356563.pdfIn PDF document text
    • https://mkart.it/uploads/file/52940200600.pdfIn PDF document text
    • http://bienbao.net/uploads/files/95094503049.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/taferabazubowu.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/rorukuvokoxatu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109012348025599.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/sokuminefe.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/febulibesaperodo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bemetewopuronazigatadi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0nk7a3n8udpbk7624mhjvnqpb5/34689790129.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/5204877708.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/banelajofafe.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_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 10620 bytes
SHA-256: d4e13b159185979e6edb8979e615ec8b2172c6fb45ba63480bbfb55bb5332db7
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 18328 bytes
SHA-256: 2e6e28dba8b9ab455fce17ba95183c151daf80b3b1745b419ad64686812274e8
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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