Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9188d4dd2b9ed0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 17:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2456ecee7a1a1848550fc6f54b2cf3f5 SHA-1: e009debd772ebb1bd8458ffca6dd2050e38e9fd3 SHA-256: 3d9188d4dd2b9ed069701afd8583403a155513a138a14bd12f3278be52ec08a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This heuristic, combined with ML and ClamAV detections, strongly suggests a malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://nomylo.ru/uplcv?utm_term=lively+wallpapers+anime+pc PDF link annotation
    • https://hearing-outlet.com/uploads/files/202109020848165666.pdfIn PDF document text
    • http://shopabrang.com/images/files/46759418334.pdfIn PDF document text
    • http://jarosi.hu/files/file/73384383889.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/81265038964.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/49494669059.pdfIn PDF document text
    • http://onlinevay.com/upload/files/66935634197.pdfIn PDF document text
    • http://chinalabware.net/d/files/susoladubofisi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitavafitirekidu.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109251936572677.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/87176490472.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/46019236259.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/kivepi.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210912031902_39975118.pdfIn PDF document text
    • https://strechybenesov.cz/content/dawezimafujomogufenodisi.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/31165794029.pdfIn PDF document text
    • http://alkanboya.com/files/file///83493281361.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/52400397861.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/30558130073.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tqf94uvbffigv5atikvpk688a7/tadokosiv.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/456f2b9000e9d5f75231f2e470e93eb3/1311366598.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tijunopanefesolejimax.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/zokazivafolurososuluw.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/kavuxotozepinivu.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://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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 10540 bytes
SHA-256: 6ee2d321c54bbbca0d6d78a46c78e48cc1578fffcc8ff4a945bba42b8da2c130
font_01_sfnt_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 15932 bytes
SHA-256: 05cbeea27511834a0e45fc4d393fa4931e42be533d0213472c38de8b072df5ba

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