Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7d8dd83355e9fa…

MALICIOUS

PDF

97.1 KB Created: 2021-09-13 21:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 401fa0828f1441dccad8941119430071 SHA-1: 50c15de6449402e43f3b746596a00b5828058a10 SHA-256: db7d8dd83355e9fafde48cf51bcd90913801b8f805b33a98de5474f4deb21f14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure the true destination or distribute various payloads. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://maggievanostrand.com/uploads/media/file/27517671923.pdf In PDF document text
    • https://lekkermooi.nl/userfiles/file/fefexasunobuvej.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/xaraxasojotel.pdfIn PDF document text
    • https://producto.works/userfiles/file/59295379167.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/81996669434.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zowiwubarunane.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razati.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901132244.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/rifetujugapuzerapumebal.pdfIn PDF document text
    • http://zgic.ru/!upload/files/55926501469.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/fapiwilobabaki.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/70712607744.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jupiwilubape.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610f02841f---lipepasasobixabujev.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b16689de---jupenerobufokisiwobogijen.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vinezaxavesatug.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911054350.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/xonotezebanun.pdfIn PDF document text
    • http://orenprom.com/img/account/file/95218781320.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210914_A79E1CC3881D6D6E.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/70899017509.pdfIn PDF document text
    • https://kenadong.com/contents/files/bukofa.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/17691000204.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/92490766998.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/57701579645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sd+card+stopped+working+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_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 18768 bytes
SHA-256: 601ab447da1b55ee6985d3698f878a9cb2b372793d1883f0c54b30a0df0a1c16
font_01_sfnt_off00014506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14506 10896 bytes
SHA-256: 5e44e21378caf43d90d5b8de8fe59355355c213efadcd08d05d1c04deee3f70e
font_02_sfnt_off00015e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1