Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d80dff042dd5b1…

MALICIOUS

PDF

95.6 KB Created: 2021-09-16 18:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4de34f62adc11ff94afcfd1b88f3c370 SHA-1: 67626e3f4ccb45def70d8a062ed7cb6e7e607db0 SHA-256: 30d80dff042dd5b198d8b647e55d4a34184c23cbab24c2d15cc95a1b7ccd9d91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains or are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The PDF structure and embedded URLs suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crewmak.ru/uplcv?utm_term=android+emulator+surface+rt PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141383940a3e---89198306624.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/gegatuwono.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/jixapu.pdfIn PDF document text
    • https://digireg.cz/upload/64183499241.pdfIn PDF document text
    • http://tayles.com/uploaded/zabuverezodajakomini.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/30866695027.pdfIn PDF document text
    • https://stvorki.ru/files/file/67027287088.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/27176286669.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/83870130811.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xakokepido.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/renilib.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/gadibigasotot.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/31078654447.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/9012415391.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/gefolodifekegifo.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/86781009081.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/34097390969.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/boxetojewariduwi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/lurarazugeroge.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/26754339108.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/tazusijiv.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_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10716 bytes
SHA-256: 9bf527f2d83ca3c964515c828485153225f0ce522e495b1b26763815c215e922
font_01_sfnt_off00012a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 18228 bytes
SHA-256: 2022553d813d81d0c596f41897aa54dea10980314e7954688bcb35f023a7068f

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