Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9683893638770e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 07:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 03f4635c9697a20db92572cafac3e0c9 SHA-1: 2913469ad91e5851e6b2694e713fd399242bb785 SHA-256: da9683893638770e58cb4160ddb8a25905cedeb1c07081a0ac40d883ac79aa4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm. The embedded URLs point to numerous other PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mmprogetti.it/userfiles/files/82953027811.pdf In PDF document text
    • http://architettoangeli.it/userfiles/files/16777949258.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/doluxexezefusajesapora.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/pitiwi.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/27232967008.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/63644117022.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/23495201350.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/wowuzimarubo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/7438073487.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/gowobaved.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fazepexasi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/figeniretulovelimolixowa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7ce20989fa371cd8fb1e8dac86624e96/80968024794.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/27780068853.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/58815203721.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nutugibagemuwuseluwetiw.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/54676261894.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/35696091625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jak+zainstalowa%C4%87+windows+7+na+tablecie+z+androidemPDF 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_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 17964 bytes
SHA-256: dab8a924265a7ec8838d048b7bada439ba93d432d9a1647d5f255225c9e39968
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 11088 bytes
SHA-256: 30dc500b3934b7f1a0b3d492a04344629b7788aa4cd79d566d939dd5f65ea38c

Open this report in the interactive analyzer, or submit your own file for analysis.