Malicious PDF — malware analysis report

Static analysis result for SHA-256 799d6e5886d548b7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 22:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6987e81a2b42b8184a4535ce1d0f4571 SHA-1: 14ed80f0ee63f7d1853318cc1ddc0f467d8da8d6 SHA-256: 799d6e5886d548b790dd6bd401b96c8162f02990d5f57729c6438e002121e5ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://riosemarescentrodemergulho.com/ckfinder/files/32357341090.pdf In PDF document text
    • http://trunglam.vn/uploads/userfiles/file/19206014893.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/leberoxiwujuwa.pdfIn PDF document text
    • http://sns.hu/_user/file/16535091080.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/69588990058.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/27363159717.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/95659566425.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/54242553908.pdfIn PDF document text
    • http://myphamasia.net/upload/files/xoralobirofuzawij.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/86746604763.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/63889341288.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/44156495356.pdfIn PDF document text
    • http://afro-safari.com/upload/files/35044432784.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/24383880526.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/subufil.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xuxumudapewo.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/32865151163.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/46704871026.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/19795994638.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/9012896412.pdfIn PDF document text
    • http://zkpower.net/upload/files/lovuzanoxumunajixujizal.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/lerex.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zazurexumugatesevemewuxin.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14cd73dcd6392cb635734574460fb8d3/22107634967.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/magerareziduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=asphalt+6+adrenaline+android+downloadPDF 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_off0000bec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC3 20420 bytes
SHA-256: 84e3922ee9a4297dc6383a13a84db31f7a38a27f8a280dd06b0181372139052e
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10724 bytes
SHA-256: 4277b7d875a3286a12fd89db095bbe540ca933264429cfd0de0b54df6c890c3f
font_02_sfnt_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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