Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d70015acbd127a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 00:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7653ec9c339726311c92d920e57ccdc5 SHA-1: a587bbc18cd30ff58b233bd3b99e18c7ca0af28a SHA-256: 66d70015acbd127a91902f33ccc7f9496ff3106a45bf2b820c05b4980cd0205c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. Numerous embedded URLs point to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of many distinct hosts and links per host, coupled with UTM parameters, strongly indicates a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/50369105355.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614267b47ff89---sizup.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/19128518773.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/98591212359.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/86842531533.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59174593c---kikadorolikamuwutirerip.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/womezatonoxigikimotal.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/22780719441.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/milorifolisewixifaxafex.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/20598824184.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/zifefeveferaxokow.pdfIn PDF document text
    • https://33mobility.net/uploads/files/peneravuxirotigut.pdfIn PDF document text
    • https://sentralperdana.com/file/66746580947.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/wuropunizukibukabekokavew.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/lowosamivoj.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/kibofewuguzopik.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/sidarugos.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/89794822412.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/lalezuxobenos.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/88717526862.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/5308735532.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/rojukejiruzix.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109171316397912.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47744507104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=stickman+fight+game+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/21500303257.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_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16532 bytes
SHA-256: 65865ddd242e3e214f511b5a23edecb69852d428bed00d9f720aa5f151f308e8
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 10908 bytes
SHA-256: 9cc40d017518717da8ce7f856b63bdead0dfacad238ab4b99a2f987ace5c886a