Malicious PDF — malware analysis report

Static analysis result for SHA-256 4738cda6f5f33c4b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 16:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7bf6e7cd09439a94571cf4e6c80f3939 SHA-1: 445f7366433d47c55ccb7898cec974de4e06b910 SHA-256: 4738cda6f5f33c4bdad79130cd67de571779bbf6c7dc76d2eead4f5a9a5cf714
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://njshore.drinkpoint.com/uploads/files/65001201914.pdf In PDF document text
    • https://gfwofficial.com/ck_imgs/files/morimumesegalelipo.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/gobubibopelelirivibade.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6a3f4eb6ebed79e630152d42969cbc60/zexadilu.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/pikemipevijemutunika.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/98550921162.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/tekoriguxisujesiwudetupa.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/sabafafedafekobij.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/80031238338.pdfIn PDF document text
    • https://arerp.kr/data/file///54545368577.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/68086049882.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/gitajefulorebenav.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/13de867251806166576e45316684d5aa/kuwozurir.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/taneraduxuj.pdfIn PDF document text
    • http://104408017.linker.tw/files/xemono.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/55777706150.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/wujifavogaronoxu.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/73025637965.pdfIn PDF document text
    • https://path.mn/userfiles/files/98444117226.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/sikiseratukolopanilu.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/27096003234.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/16792436153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=resident+evil+5+mod+apkPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 17516 bytes
SHA-256: 043b19d2b6db44467377ab05003b367878e32c724ae4e83080bf240e9d1520ad
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10788 bytes
SHA-256: 397154a6594edfaa470ca6463cca79531c9c1b64665e44d3779bfb384a30dc2d
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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