Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39bebf4216d5a8d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 18:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6ae6874d71b2b20d3968ae8e311b8924 SHA-1: ef505efab3765ff612806c4eedbb450dbead3528 SHA-256: a39bebf4216d5a8da08eebb46e7a8c8f9183885a86bd0c6a014165d14b6e6048
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://sanchariglobal.com/userfiles/file/xikanamakebil.pdf In PDF document text
    • https://drhuanghair.com/uploads/files/202109160252165222.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/leketugugofizifugo.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/22687295192.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/defifukepiviridarujam.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/4058421753.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/6090706910.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9e69125e---jopudufixurub.pdfPDF link annotation
    • http://ranjitabiswas.com/userfiles/files/90380298747.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/64867935337.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wiwoj.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tubokafodefikofelixarap.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jopudizis.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/77414194187.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/75847107132.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/xewivonaku.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/15192445834.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/45862877905.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/67860420257.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb44abf857---42604208935.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/vowafanezalegej.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/semomazejewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+get+album+artwork+on+my+androidPDF link annotation
    • 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10944 bytes
SHA-256: 01f8e87c929e89b04a70d44119c8473e6300f36e7587186b7923ec990cf805c2
font_02_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 18708 bytes
SHA-256: b1a2559e05a06e275baf0025852a7e7c5ee505cef03eff932aa97e9215a6b1ef