Malicious PDF — malware analysis report

Static analysis result for SHA-256 81961f8d3bc5d53a…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 20:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b8ecaf0fc1377f26eee5b12b1b94091 SHA-1: 1db530999438ae596541507d1e1f1a8ab86c0f44 SHA-256: 81961f8d3bc5d53a57c1d6059e8052f6d3b45521e2b66d12c7dd71e666c26546
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://homeshopeez.com/uploaded_files/userfiles/files/29685072617.pdf In PDF document text
    • https://breedlife.com/upload/files/69728182839.pdfIn PDF document text
    • http://topstec.com/d/files/39506228341.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/kapokufit.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210905030804_bgec6j.pdfIn PDF document text
    • http://sjanzee.nl/file/mazelufifupodatuketij.pdfIn PDF document text
    • http://gibisch.info/files/files/dukazuta.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rewerawitusulusi.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/64861816137.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/94038954307.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8g257lia03r4jd5ahi06s5bedq/1295683546.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/85210168191.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/68907891246.pdfIn PDF document text
    • http://slsnn.ru/content/file/3714112253.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/22945352859.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tewev.pdfIn PDF document text
    • http://123dvere.sk/files/file/31748558869.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20453052195.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/vasasulibe.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/sowaxugafuwike.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/vedemajuxoronefa.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/jumuwisudubifele.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/rovabasufiziduxudig.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/74818182510.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/vokanepuwakimorunidexek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+meaning+of+extraordinaryPDF 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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 14788 bytes
SHA-256: 19862b802a0e7cb0aa29c49f8f6a33d025c40132a1298a0d82c261b357bddbfe
font_01_sfnt_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 10764 bytes
SHA-256: 44b0a48b6728f633f483c2cac36e1fa8f525a682e8ed987424304f08c807f3b6
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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