Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2638460e57ad8f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 09:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22cb53018176509562515e853055e463 SHA-1: 4b7d540c889cdbba9c6ce1ab5aecc075ea520613 SHA-256: 3f2638460e57ad8f03e650d6d75602d786bc125a34da54d2f54b42a1021beb3d
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a lure to enable macros or editing suggests it's designed to trick users into executing its payload. Numerous embedded URLs point to external resources, likely for phishing or malware distribution, and the document itself appears to be a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://smidgel.ru/uplcv?utm_term=dns66+ad+blocker PDF link annotation
    • https://fuze-pay.com/ckfinder/userfiles/files/64785488146.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zemerigelejagigenajuvol.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/76476938060.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/wovegovakika.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130eac36f2c0---69848153583.pdfIn PDF document text
    • http://hrudolf.com/userfiles/25677627222.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/82242061489.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/59905411180.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/zedelokologoxezamaje.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/18314347226.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/jonubip.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/57268870012.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/walanizepemonegadapujamo.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/netaso.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wigetolimabi.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/vilujajeju.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7651dd03---63058609857.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/39660125106.pdfIn PDF document text
    • https://hobbypet.cz/files/file/sinebe.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6014169552.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/75959774937.pdfIn PDF document text
    • http://maxbrio.kr/files/files/95562053963.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/37229140755.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/52783498542.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9D 17404 bytes
SHA-256: ffdf68698d5f3847a1ca7c96af22e5019d801d143cd377d60e177975edf7e71f
font_02_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 10572 bytes
SHA-256: 1b13bda1b91295918321f37623b00022b95856169926332dd1305af4beaa9721

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