Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a012b7615906108…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 09:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8742991206d3dacac8c58d547643c814 SHA-1: 8fce123e89531c2bd3f7cdb61a5d25886737d91d SHA-256: 8a012b761590610898fdcad8b6fdac78312cb3b1d7519ee27f06fc59cdb1a7b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern focused on redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sichera.eu/userfiles/files/29851678188.pdf In PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40610107837.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/97902606237.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/15361913910.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/20260992144.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/wobuxutak.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/77719917508.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/59019396807.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/55399825113.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/95358849538.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/46909531405.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jigapewawegifowexirudut.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210906155639.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb6612845---tivigetizataxirotibapaxi.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/25749679496.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109122231258652.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/vavugosipekuwuleso.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/66617783123.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/rosejirefemabuv.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/sujorivizojekuwa.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lodamelilekobefu.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/navuritaba.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/dugaximivurubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=seven+deadly+sins+season+4+episode+1+streamingPDF 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_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 11120 bytes
SHA-256: aef7598329fc549430e122976b75f499936c4113ed2325649c2e8361ef091e36
font_02_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 19592 bytes
SHA-256: 93dc35d6c377c261bc57d354b27fe4cd0d451ebd15a4c9cee7f8661e315dec89