Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9790b5678f02f99…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 10:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4606ea228553d76212fab24b43b5c5b SHA-1: c9374b0299994d9f5e480a9208dfa1eadb1c2600 SHA-256: c9790b5678f02f992bac65f11c00be8cca41aba7700442b1943e288a31c88c0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to unknown domains, suggests an attempt to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further indicates a pattern of using disposable hosting for link aggregation, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1c119056efed86d13475f62273f5cc8e/geforulilupawaw.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/57472669262.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/53823827335.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/22899679909.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/kupumudodamajuzik.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/96082810782.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/11464724553.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/fowetijiriterasuji.pdfIn PDF document text
    • https://italvaping.com/file/8867130002.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/47483677813.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/buxolulimuwejajowupo.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/ruvadutegaji.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/rukimituvamisuzexiwaluzo.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210905180319.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/74711952313.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/bagese.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/36810208829.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/56890162944.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/sigagumanafu.pdfIn PDF document text
    • http://parentini.it/userfiles/files/53038551630.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/77401773408.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2007270468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=surface+pro+7+vs+ipad+pro+m1PDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 10876 bytes
SHA-256: 10b1f5b2aa947ba6549ae2787b81511e74823013868303f9757fcdfe460d2e6a
font_02_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 15468 bytes
SHA-256: bdf5a66b04fc74af8250070ba7590b291b128c8c28a2f0e51b2d81f497f3ae08

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