Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6dfc4932700fc3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 13:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9179ee46cf3c86a648df759f5400830 SHA-1: 9d808eae9b9fe6e7206b62ac8029ffea20b255e4 SHA-256: fc6dfc4932700fc3744c342935b92d9125d5ce755e30a67563d33f5ba318b96b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://meritumptt.pl/dokumenty/file/16113559.pdf In PDF document text
    • http://w3-japan.com/js/upload/files/lojirigokuvoje.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/8956495652.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/werimowo.pdfIn PDF document text
    • https://datajournonepal.org/files/tekaxifixato.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/24806515458.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fovora.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/28eeca30c59315f440c2e18bf6155e52/73179701867.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/letavisojujofilesi.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/samesewikofiwuj.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19164978761.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vudomevixejamog.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/82399661487.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/39390288921.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/38954336507.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zegobapizusa.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/87228369923.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/87ff4799c0c5cd53cd482127725d6466.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/61954679848.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/werinituregox.pdfIn PDF document text
    • http://coumert.com/images/file/53002149705.pdfIn PDF document text
    • http://ausafe.net/images/art/files/dumipolelinamanivawes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=unlock+sim+android+freePDF 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_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 10640 bytes
SHA-256: c95a5f0b6c6a574e58e656a997685778bbff8e4427c94485e94dcc82e4cd7abb
font_02_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 18028 bytes
SHA-256: d9cb39352a64e534e75be1fd411e17e578daf63c3f9d2a162099b7699d7514c6

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