Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e25e8931f4e055…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 13:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1cf7b7ddd562f6ae86cdef93e15580c1 SHA-1: c682ce7a06ec3e4152d1bee0a536564452f806b6 SHA-256: 37e25e8931f4e05524c38ff2dadfd430cfe768e022a01399a370fb4764538050
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, including one pointing to an IP address, which are likely used to redirect users to malicious sites. The presence of external URIs and a link farm heuristic suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=how+to+unzip+a+file+on+android+phone PDF link annotation
    • http://140.121.161.111/ckfinder/userfiles/files/34480022859.pdfPDF link annotation
    • https://cihangirhotel.com/upload/ckfinder/files/dokoju.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9969cb2b---5503992277.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/76725903385.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///38736769930.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/minadanatarimel.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4717640886.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/13654159355.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/32255472918.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/jatilogifulanugogivuko.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dopefetiwulot.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/88250111000.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210906_BCB641FA5BEDAE72.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/kofituvuvaneniwurojotip.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/91744986650.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/37027108378.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/48064664279.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/36968617127.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rutejomuvuterogudib.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210909105325.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/87625106119.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377aad88b5f---dojebawigexifodibomumiwod.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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 18592 bytes
SHA-256: bf9c74ac7dad37499bcea4ccc0a8b6b16ebaa1a818e9ef9e9b0b7833bed41027
font_01_sfnt_off00011e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10664 bytes
SHA-256: 799407ba8a71271e89aa5fc407365fc44aa9043d14e9c8a02310d99fec876710
font_02_sfnt_off000136f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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