Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff5fcf9c972d8d3…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2a69eb8e96ce2a59cdb3eb632cb99d1 SHA-1: d4833e87ed40c6a067bc9027472efb56d7a0296e SHA-256: 2ff5fcf9c972d8d3aa2a78a6ced5bc33f061f311ce1e53097af8deda526070cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of a disposable link farm heuristic further supports this. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://newabel.com/ckfinder/userfiles/files/xivomigilukarujopuxosix.pdf In PDF document text
    • http://numere-mopede.ro/mm/file/farujurogorimiz.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/jogexiramujedabelelu.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufomim.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/duxaluwok.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/28443709765.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/74602911417.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/46543035204.pdfIn PDF document text
    • http://jljemc.com/upload/files/60893428150.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/50541609157.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/8673463705.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/31681785127.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/45644032964.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/12055369387.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/norimabasururusakuratu.pdfIn PDF document text
    • https://khanikango.in/file/sutejoxomefodifomemeg.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/jimeginagisag.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xipod.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/bemuvakizuxoz.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/notafazoximefonigaf.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/58891319306.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/76290182390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hunger+games+tribute+guide+pdfPDF 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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 10904 bytes
SHA-256: f1edca2a809d8a827d8e08666e0c29433aa3d8f37e9edf136bbc9610ab7bae09
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17400 bytes
SHA-256: 9081e31b71456587db77d4726816f68da71568b7c84e215f99316618539f662a