Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d0dffede89dcc5…

MALICIOUS

PDF

71.6 KB Created: 2021-10-09 11:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7958c4c2224617184161ea474325f332 SHA-1: 01db10e104bef9983c72103f28a927534da87ff0 SHA-256: 69d0dffede89dcc52b27b69ed353444a2fddac660c1465d60b03db9e9ff4327a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=chicken+of+the+woods+look+a+like PDF link annotation
    • http://metall-press.ru/files/goxijijajidipeguvibene.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/83679163407.pdfIn PDF document text
    • https://aaaxxion.info/images/file/49578183725.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/47628437854.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/fukujeniwufuzibekuvofu.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/98618990677.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/10834684565.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd7b3daa1---52585167957.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/89135044329.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/39299879729.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/lonowovuwumiraxutusu.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/34755678526.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/ladogapekimopo.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/5566155195.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/putadeguzazubatolugol.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/85487563799.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/85233239918.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kipirigorexe.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109212258053016.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/61415629551.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/tixufamutefi.pdfIn PDF document text
    • http://aprt1day.ru/file/kagapigoravap.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/6054291850.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/gifabidavunerezetajekori.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_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10680 bytes
SHA-256: 813f5f5d82cc5c69e73321796db61c6ba3a31c14de0e41c899f63ad5c086c87e
font_02_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 15280 bytes
SHA-256: 0e7a427f25aba1883a819a5f22f525ac5de4e3446a173dd676c44b9a23267d4a