Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa0f16405226f55…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 13:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3aa3d96eddc9228ae35c8db6cecd4e2d SHA-1: 7ff4a51213ba875593e7ae2f8ca40194668c532b SHA-256: 8aa0f16405226f55e172d66b25c792b69455791b90d1c0ed34efaf3dcefae44e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or distribution network. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/retenobon.pdf
    • http://kaiyudachem.com/filespath/files/20210906071546.pdf
    • http://nenorm.com/files/files/neniwigodifutiropiditojiz.pdf
    • https://nisahanpin.com/calisma2/files/uploads/8366538662.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/viliva.pdf
    • http://vilniausgreziniai.lt/userfiles/file/sopinofufito.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/53678811516.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gumazubapuju.pdf
    • http://consade.com/userfiles/file/domuwakavajivutegulev.pdf
    • http://igigeothermal.jp/userfiles/file/zemonorutodekoboxirilu.pdf
    • http://www.gamylai.vn/uploads/files/nerazamavimelaguvaxik.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/73784392310.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161304f57565b5---lubenanoxo.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/1576340087.pdf
    • http://elitaliaweb.it/upload/file/tirusapodunerunelas.pdf
    • https://beauti-full.ru/uploads/files/92308131811.pdf
    • https://artgreen.vn/attachment/files/82930877088.pdf
    • http://hypotekaprezamestnancov.sk/res/file/92172939909.pdf
    • https://yuanfuconstruction.com/ckfinder/upload/files/50178031974.pdf
    • https://karlschool.org/uploads/files/202109071444073851.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/60112668677.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_0CF67FE576FE0158.pdf
    • https://buffinvestment.com/upload/ckfinder/files/72176763122.pdf
    • http://dilimkebab.com/userfiles/file/warebepalipofev.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fotupep.pdf
    • https://manorhair.com/uploads/files/202109040047429234.pdf
    • http://cuanhuaabshanquoc.vn/files/pasowepolitulafakilegabub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+android+games+on+ios
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin
fa4a3196c3425f927c3fb3f7b7cd8382166bde166b6790f1054f436be2e3206a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 10620 bytes
font_01_sfnt_off00010672.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 16792 bytes
font_02_sfnt_off00011e84.bin
356774be2018d6969d80ba2a8ad3d2e9219a73202fe82bed767b0a087d288121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 18044 bytes

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