Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd987a86d2e9ccc6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-11 08:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b34651575ebc4f49f506e7badd3f849 SHA-1: 722d297e7c1b19ecef561e9e68b1c1a0152f42ca SHA-256: fd987a86d2e9ccc6635615060720fb85ca4868bf95ffd1e702e8ef4a24ac70fc
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection confirm the malicious nature of the file, likely serving as a downloader or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=download+pes+2016+for+android PDF link annotation
    • https://pernambucoimortal.com/imagens/files/16202701564.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/79367902906.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/wilomimoderul.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/wawarepenivogadiwutibup.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/40056782251.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131f507b9665---posowudepevaduwulibiv.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613686c48e92f---lijeron.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/8972345620.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/96541207609.pdfIn PDF document text
    • http://vhz.cz/user-files/fuvesurexorumewuwe.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/wavurojizu.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/22645205181.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/wegasovif.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_022720.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/30317031026.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/vedutuvig.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/34957697366.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gomefutipomevamupukixa.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/21434057397.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/bumopezof.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613141644c567---50414586109.pdfIn PDF document text
    • http://biomehl.com/images/content/files/lixod.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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 10940 bytes
SHA-256: 32fba58ce093fd1319390c740f53e58358043fd79dce98ca820c21f040e8d1e3
font_02_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 14492 bytes
SHA-256: 489ab9b79e94589881e994723d077fd7a0d3425646c9a904ea57d6c2b58bf534

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