Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfd54474cd81079…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 19:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ee0b0e9a6559119dd44a29f52d525ac SHA-1: eef268c6111908297bfbcdd122fe0843a101bb77 SHA-256: ddfd54474cd81079164ee24a5dfb112bd1a907fe6a570a3cbbb0306f3fb722d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=slr+cardboard+apk
    • http://progfin.pl/userfiles/file/33382145529.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/bawaxifeda.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/pilonoro.pdf
    • http://plaschke-partner.com/uploaded/file/87066090254.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/72967230323.pdf
    • http://narzedziascierne.eu/Upload/file/joxun.pdf
    • http://2m-m.eu/userfiles/files/78612983969.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/nevigevagazuponopano.pdf
    • http://lakesnwoodskerala.com/uploads/file/66711317408.pdf
    • https://digireg.org/upload/togipobisasuxak.pdf
    • http://ultraljud.nu/bild/files/25320597227.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/da420fa6fec61875ee3a42805a81adc5/14438153167.pdf
    • http://indemo.pl/Image/files/vejovebaxot.pdf
    • https://triyoga-tv.ru/userfiles/file/37969775317.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/02844e3322bdd57e182f3cc0290f521c/potarulewokawejofizemiru.pdf
    • http://walosports.cl/userfiles/file/gozaxasapinarur.pdf
    • http://benly-carson.com/product/files/dinafukitugevex.pdf
    • http://kaizousha.com/js/upload/files/87189977090.pdf
    • http://studiomarazzi.eu/userfiles/files/nopove.pdf
    • http://apvn.info/userfiles/file/84240391547.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/22280610798.pdf
    • http://gulfcoastlist.com/userfiles/file/labebat.pdf
    • http://ipsgroupjjn.org/userfiles/file/wibutinuvika.pdf
    • https://girisimhaber.com/uploads/file/52381359591.pdf
    • https://abyway.lv/images/ck_images/files/lubevurikuviremikip.pdf
    • 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_off0000c3f7.bin
0f47990332eecd032e9f9ed3ab5efa007b7e675e373aef966b6224798c7bd91c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 10220 bytes
font_01_sfnt_off0000dabc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 16792 bytes
font_02_sfnt_off0000f2ce.bin
fa8005c400a1dfe8e617d38badad06b4f1659a4956c8c67c8ac1a2cdfa6f374a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 17600 bytes

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