Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c8fc99a7d2b7ac…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 21:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fabfa82b18a739ee84ce6e41f832bc97 SHA-1: b5af8d6b41048ea22f72aef086caa510622c3fb7 SHA-256: f7c8fc99a7d2b7ac97a5560a4c1ad81fef15343110f6c1d3af4ae09014a03f68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=start+with+letter+w PDF link annotation
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/daxosofunopugowizube.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sukawuzoxukepeloxove.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/penele.pdfIn PDF document text
    • http://generoussecurity.com/uploads/78170153379.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/48503325060.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/jifoxito.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/ditefineginabutikobajegu.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/74503590522.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/739838897.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/79807816753.pdfIn PDF document text
    • https://atrax.hr/files/97230022776.pdfIn PDF document text
    • http://machulski.com/public/file/diwogenepixetefatikeka.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/dojejabuzawatuwitiduga.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/katoxox.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/17829894016.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/setagijogabi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/bajadodumuvedo.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/84307510957.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wewaxopa.pdfIn PDF document text
    • http://zimmerei-possert.at/bugojuvo.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/83654078018.pdfIn PDF document text
    • http://aven.su/userfiles/file/40234474780.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/91989372086.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/lizewuzarobiwop.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 9972 bytes
SHA-256: 6fcf2ce088adf004138ea452678c7d7be3b7064e89f1c96c10c634429ab77bc5
font_02_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 17836 bytes
SHA-256: 3d4cde966a431e5397b3ec86ff0df41335f949c449878b79f67190d5e0a0fa39

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