Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cc379efe79d34f…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec0632605b9fad252d88e3ae92d1c4e8 SHA-1: d6841100e44b89aef81e4c4fd8f5d3352353cd86 SHA-256: 01cc379efe79d34ff6ab1cb8885652cc0c123b178a7ca23822b5b3258b7ca19d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. This suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or to download further malware. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=nas+ft+lauryn+hill PDF link annotation
    • http://klubalfa.org/img/userfiles/file/62565141838.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/27892237459.pdfIn PDF document text
    • http://eternaseguros.net/files/files/zoluxekakovezarezebunara.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/sutetinonudalimifa.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/65813348761.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/kevudofenapuxofozejunudo.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pizenuzizilutituxun.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/dovuxobi.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/rejumenupoxa.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/83445401863.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/69516943591.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/wigotatadawat.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/siminafikoxe.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/50723853601.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sazabizozix.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/natiloluz.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/52505569466.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/moxepenotatiziraberokudef.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/welumanibe.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/47824534492.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/34689942254.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/befonalukoxarobe.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_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 10252 bytes
SHA-256: e3ea278cf620ffb785f65153b4a3820bd8191d1490586efc2d491d9c7a09011e
font_01_sfnt_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 18048 bytes
SHA-256: c20088100d11a60436daaacddeb862f6aca0c74b55228d759c72a7ffa0dca4b9
font_02_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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