Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda307821bff6daa…

MALICIOUS

PDF

88.8 KB Created: 2021-09-23 18:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55eb8ff7527d01064525d3253887bb97 SHA-1: 63258e3a4038cbd482065e668a7f0c793d2cfc20 SHA-256: dda307821bff6daa76ed2ba80e6d8de008f83d52c707d3ec97912f8ac9040af1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, including one with a raw IP address. This suggests the document's primary purpose is to redirect users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://casasholidays.com/scgtest/team-explore/uploads/files/26505116046.pdf In PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/bajevodoxixuxebuwek.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/rowixaxaxeduvugul.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/nuzajotezeritugeb.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/68549895881.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/15640085827.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/66047428921.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/buxit.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/73371104885.pdfIn PDF document text
    • http://ore-processing.ru/d/files/80675633723.pdfIn PDF document text
    • https://5uempat.com/contents/files/72038314744.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/91005146079.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xunakapogilukikitibe.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/30210317865.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/38785689311.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/45854633565.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614219374bdc7---4926971750.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161480860134eb---divovariloludiselut.pdfPDF link annotation
    • http://tdbm.vn/upload/files/67243805007.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/23090750161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pes+20012+para+androidPDF link annotation
    • 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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 25356 bytes
SHA-256: 59e8f0e469687cd8b45be8b4098dbce70a7fec6357c8f705d87b19e4c8902174
font_01_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 10536 bytes
SHA-256: ae1ee5fb9428314de500e5f7dfe46ec5e29a573ed8ee934b398d5f42d655eb98
font_02_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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