Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd3f16fe6c79694…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e3fcd90585bca393547e61e59affed6 SHA-1: 31ae05df3f3298f03aba74f78ca8e0e014876594 SHA-256: 8fd3f16fe6c79694ba4c3dcd452ca69519993385db0abf9c44585b6c7f9eaacb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The PDF's structure and the presence of external URIs suggest it's intended to redirect users to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=escape+room+2019+free+full+movie PDF link annotation
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/79213789493.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109060544259661.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210903_9_16_5.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99df3b53c---59198563990.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fesirel.pdfIn PDF document text
    • https://samudra99.com/contents/files/84360431896.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/muzejusavataligaxusixigek.pdfIn PDF document text
    • https://desco.scp.hr/files/depemakonafivurinivinuk.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/95700040894.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/tinezumifot.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109050735302279.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/vovabevabelulow.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/29968029230.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/61812556607.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/memeravizir.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/ruzogulikivetexapog.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/dasakom.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/12224843505.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/63942986442.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/80623832730.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/subamufobodifoxegu.pdfIn PDF document text
    • https://bawauang.com/contents/files/tekakunu.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/ruzilobezap.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_off0000b539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB539 11052 bytes
SHA-256: 7dd27e182be3bdfc976038fdc0b97eefddc435c11c67914269e0ee8b55254a18
font_01_sfnt_off0000cf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 17088 bytes
SHA-256: 603c3ac62cb59ade92926ce9ce538d873e18f217b9320e2fce0eaea5cf766459
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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