Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c0d9de1639ff84…

MALICIOUS

PDF

71.9 KB Created: 2021-09-23 17:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77667e10c75aa43d3d6e56f4a69c153a SHA-1: 6319a2f1185a1dd6594d59d4bbac3d0c98f5a875 SHA-256: 82c0d9de1639ff84e53736f13697778432523631921fc89d7be5741526182a43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which appear to be part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=clouds+timelapse+free+download PDF link annotation
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xaxaguf.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/pugiloliz.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210916113522.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/22472881612.pdfIn PDF document text
    • http://sakem.org/userfiles/files/8217648246.pdfIn PDF document text
    • https://partnermind.cz/images/files/4015014086.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/wizelojizoker.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/85004431721.pdfIn PDF document text
    • https://zhansq.cn/upload/file/42662394843.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fajoradefolixegelodoseji.pdfIn PDF document text
    • http://att-na.com/upload/daxukujopatugi.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/21939039423.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/sisoba.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/75339380829.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161331020a5ba7---kubinipoxikobirojolat.pdfIn PDF document text
    • http://roocenter.ru/upload/file/55972023405.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/wudoxezebexej.pdfIn PDF document text
    • http://preiss.at/upload_files/files/fosuzajurufufujiremuga.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/kalopinupibul.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/punapuxanofimigelukemum.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135308c4afdc---domixek.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/95200649585.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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 10876 bytes
SHA-256: 462a823c7f26cead11d9d078351c6d1b14d99157ff26aa36694cfbef7d074345
font_01_sfnt_off0000d3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CA 15148 bytes
SHA-256: 288b408797c0baec8f9b1285dd6e6eb8dfaa6b4ee0c6e7bb0db1a0e68286972e
font_02_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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