Malicious PDF — malware analysis report

Static analysis result for SHA-256 43913e044f8bf781…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 14:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a918b517d00e8f0b08b4ef3a0a7bd996 SHA-1: b4024ee86641f248374dbd4febc999621a9a3f82 SHA-256: 43913e044f8bf7815b70d2f74d23e3f9e11cae86d212f87ba11ad599016095b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=download+top+war+battle+game+apk PDF link annotation
    • http://vstarmp.cn/upload/files/20210908_234333.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/51015636776.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/dewegovosuvijetozej.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/97010746655.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/baradet.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/93567252529.pdfIn PDF document text
    • http://dytac.hk/userfiles/82917164903.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/42162330701.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109091204415007.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/labupunonifolokim.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/supexus.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910153343.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/48561115660.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jawumujuf.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/kaxosokodapusutativugibaf.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8eb8b95ca---dezuxuko.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/juzulus.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/kidevurafoxu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/kiduv.pdfIn PDF document text
    • http://qdjshg.com/files/file/nerukikeveli.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109021513594384.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/bakuwakur.pdfIn PDF document text
    • http://lulanjina.net/upload/files/60348594142.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/xujiwerudevup.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/80367778552.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_off0000d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 17872 bytes
SHA-256: de05e27f93ea5ef122912a7f4d66070758288fc52c54ed5c26fe278ac7d8445a
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 10792 bytes
SHA-256: f42848feebc2a9e4cb6ad451a0af49eb827dd0ca42891b7a7d379d6e8c689ae0

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