Malicious PDF — malware analysis report

Static analysis result for SHA-256 a812c2503ba941ce…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 13:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d677bc0e5c8beabc8f5009276b035cc SHA-1: 69986a729d95d4a7d0a39fcc2d3e5e73ead3b854 SHA-256: a812c2503ba941ce9b6d515c0073c168de2230155550b00a25b436eeb4015f7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of links to external PDF files hosted on various domains, suggesting a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://auto-rujo.com/images-editor/file/46041238171.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/68988631298.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/80463525374.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/90595367089.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fepaweladalokupowa.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/64881990241.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/91560256314.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jebijuferovufefiwedezosom.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/9229935201.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/20947200059.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/wofekoxefixamazataxemuka.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/15842136645.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/lerofinumeturipufetafaze.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210905194724.pdfIn PDF document text
    • http://superazs.ru/images/news/file/zomuxenate.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/64809504777.pdfIn PDF document text
    • http://e-sheremet.com/img/26424915724.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/76985726196.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314a0dba9c2---fedofemexupoku.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawijor.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gonelag.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/nuvaloposuro.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/majawakisifabexexokux.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/jirunaxiz.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/66653147645.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/kuzezili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=setlist+helper+app+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_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10564 bytes
SHA-256: e912a7668ee86ef30549e903607cef395fd31d78230be5c7671e77bc490d19fc
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 17084 bytes
SHA-256: ff3a202bb7148057f8be81ee29bb2f732d948aa1c2d92512407b3ca45db132c7
font_02_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1