Malicious PDF — malware analysis report

Static analysis result for SHA-256 e580770f83496ae4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 11:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efb119482ab4554c971ceed018f86e28 SHA-1: 9dc58b89abd71914e3d699b6ec475cb7afd74401 SHA-256: e580770f83496ae4c7e17e202b09affd4d6ff9081fd3427a7973310b790a1469
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it is designed to redirect users to potentially malicious content, possibly for SEO poisoning or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://strategie-online.net/catalogue_dynamique/file/39049247979.pdf In PDF document text
    • http://klpa.net/userData/board/file/67204840510.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/torapixabutefarikeg.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/23062204299.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/riwarupegilijotunogod.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/9730143232.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/47384362866.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/wixud.pdfIn PDF document text
    • http://ahknchem.com/upload/files/43507512591.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/boweduvovofiperisisemo.pdfIn PDF document text
    • https://mcsfood.com/images/file/saruzabufebiroxe.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zefupusakubaku.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/leripoxanul.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/70236986205.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/jelezumisibobivogo.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/79540185208.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/vikilomimigukikuxufe.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/62012268187.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/355dccd29b501ea22f6e6ec4660de9b0/saporizilo.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/29185519084.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tiribelilebop.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/debisetirug.pdfIn PDF document text
    • https://kultmotor.hu/images/files/9100893018.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/80434659204.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gezivifox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=navigation+widget+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_off0000b1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A4 16224 bytes
SHA-256: d045e9b03cb8898de84b8a77844f5c4bac28a049ba6b3cb47494ee87bc326d60
font_01_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10340 bytes
SHA-256: de7b66480717bec2e7caf1baf3f84b4f82315dffd9ddd5320643d62922850f1e