Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8fe4e2bf9b82fb…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f18c1b898191975a6d23368f9e6329d9 SHA-1: 23d092372bcad9c2c8449015842f744e89dbdf36 SHA-256: 7e8fe4e2bf9b82fb31eb2d5cb2f37cdcc0bf86f699500af30ff6a0cd49b6a32e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=trivia+360+crack PDF link annotation
    • http://princeverma.in/uploads/files/sexuxetirima.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zeruniwidaxote.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/xukofojumikiti.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/86261686674.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/78704128453.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/da5e44f0e5f8925096701e9af2f914f7/pulovesibe.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/ponizofekugemokagalewa.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tigazajedej.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kazejosepaguvijopum.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/39786832676.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/pikopigedadid.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/zidog.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/40230107268.pdfIn PDF document text
    • http://sinners-party.de/media/file/59866115558.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/35828179598.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/votafixasa.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/95552492999.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vovojonunosawobizisukig.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f6b18385c72409a48fb9672c98797f6e/86400319943.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/zezerogivez.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/gumeralab.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/nibajedupubeba.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/fererali.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/lulavifujekavimugarexijuf.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_off0000b045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB045 14476 bytes
SHA-256: 41ce494947f016f1911ec8df8b7b8674ca4e4f40948959d39a66ccc0b68e2702
font_01_sfnt_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 10140 bytes
SHA-256: 7117d3235219676470e8bcc3ec32578d7529c23c5ca06d260b063756e640860a

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