Malicious PDF — malware analysis report

Static analysis result for SHA-256 219114cd95eb6813…

MALICIOUS

PDF

73.8 KB Created: 2021-10-09 07:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e5ecb0c11d5ce84636ad93f15276b3c SHA-1: 0b152564f8a841c79451c791ca091b045e7dea6b SHA-256: 219114cd95eb681343ccc9b19afdb2c938c74af6d6dc62e5ebb856d6e9fc4d82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=simulation+meaning+in+english PDF link annotation
    • https://sofupingame.net/calisma2/files/uploads/sukejife.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d945401f363ab5f9074df09609534dd0/wowirupugiparus.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/38426882718.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/75635385830.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/45415880334.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1aa58ea---20544198782.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/pewisenadibitel.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/kafakituwewikokemewenagud.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/63530903798.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tipifaxovit.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/mepal.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20211005023519_ip0fv2.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/77622330608.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/19346389889.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20211004084446_1324173408.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/34561689998.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/16318114260.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nekenapetenuze.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/63458232515.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/79490933292.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/zutud.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/mulanofozufinolub.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/40412478137.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210911233010.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_off0000bac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 10628 bytes
SHA-256: aae07c29bc833a46c9913b9e8042825f302d2cdebfb7077da57497a57676c817
font_02_sfnt_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 17736 bytes
SHA-256: e95b70e033a38e03ffc1db1557fb17c7ee6a6b58071791f13e4c2bab12b80049

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