Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1625616ba9bc44b…

MALICIOUS

PDF

72.4 KB Created: 2021-10-07 19:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f965eae1ebfd1eaf898b12566d15fc17 SHA-1: a4c018d6ba9456fbf1a655d4efd80fa7e55e92a3 SHA-256: e1625616ba9bc44b700428e87801b542d2b67f8a8c087cb80c99596ebeda6a4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. No scripts were extracted, but the presence of many external links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=ms+muscle+twitching+fasciculations PDF link annotation
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vewux.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/kuguvarekifopotam.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/93655983956.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/80336213253.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/wurojawam.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/gaduzufaxiweburipelu.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/27454365410.pdfIn PDF document text
    • https://norservis.com/files/files/pukotofadogexajes.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/fapozapamagiritejufe.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210915225427690954590.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/83206667217.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/071021285633.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-04-21-11-55-9uO5dF5S.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/76231794542.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/wubet.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3obe5i9ru1rup3lj7kfkjm4qd1/wadozumikufonurivup.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/12713614248.pdfIn PDF document text
    • http://orderkai.com/uploads/files/75070101877.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/puxudajeposiguzel.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/wakojolokemebizigag.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/2466810432.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_off0000b883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 10864 bytes
SHA-256: b71ece5e593267292b3234821554334266eae3302b21ddbbeaa114dfe25cced8
font_02_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16768 bytes
SHA-256: b69cb8f8a84eeb21adcbcd196442e1f20be45c31fc18801497ab0d48b9fa4191

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