Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3071a356b20228a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 11:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64ce2fa7a81e387366532dd673aa125a SHA-1: 2cd401b7243fc9f2b292c2b59fe3c71a5af0252e SHA-256: c3071a356b20228a5079ff7526998ff23273e5b09054c770bbb9fffa2b1a72de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF for containing many links on disposable hosting, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=i+spit+on+your+grave+full+movie+online+free+123movies PDF link annotation
    • http://sten.kr/club/data/userfiles/file/20210906193521.pdfIn PDF document text
    • https://best-label.com/upload/files/levugogugaweserom.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/47715204784.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/30376746786.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tidirevezunogorogutuwar.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/sovezev.pdfIn PDF document text
    • http://interativacorretora.com/fotosempresa/files/sebozokixedaniw.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/17417325933.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/91525612819.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/8218919642.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/71658180852.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/24822659310.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/taxipu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pibamofuvo.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109070847252549.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/medudaluxuwekasevimexop.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d13873773d6f2d8d2eb5e36b7af13b32/xusavobowozevixaz.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/19008439611.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/debijesidakasez.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/88569862838.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/digabudoban.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/mirapenijokufexotapi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bdc987a18---7443981835.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 16508 bytes
SHA-256: d8ca7883324f2017cba3fae5d3d8c1f977def69cd0241a220d732ef2ab9460ec
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 11276 bytes
SHA-256: 8ecdfdfe89c5e2701eae1e2d86f2fee649463dc2a9dd1d89ad42b7ac3d2af0cc

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