Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46b5984553b0ecf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 22:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d86193f175737f278555be14f9eb3fa SHA-1: 192c1ec8f3500a1406eb0a076f77b9dfba93ad9b SHA-256: f46b5984553b0ecf293b79afc7f29dcd79f6ea875903f4c64a80e14f181a67f2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One of these links, http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/76710077130.pdf, is flagged as a random URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=virtual+dj+per+android PDF link annotation
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/76710077130.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091820204013.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/989883247.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/18697967811.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/tekiv.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/66954575484.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nefarelu.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tawazupajupexifewovo.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/57885256790.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7421eb86---91707536863.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf979992bc---252857077.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/vinopeg.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/16078238182.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/69776916001.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/74971502081.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/wemepu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210916020637.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/20416377312.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/pidixub.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/4656430012.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/fobijovi.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/zekuwokam.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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 10416 bytes
SHA-256: a7916f89a76a6871f434aea15e2600014fe3c87fba0f04430923b88b17aff0b3
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 18000 bytes
SHA-256: 6d171cbc5e4671c1ddff0254cc20c3d0459647e5973f4e32883ca878f3597f89
font_02_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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