Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec40aa8979711ba7…

MALICIOUS

PDF

100.9 KB Created: 2021-10-14 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c199d3b64db84d7aee53e94d0413d7b SHA-1: 3ab20d9adab1cb1a27a16a4d77aea075197ab829 SHA-256: ec40aa8979711ba75621b5b3800ed3d351a374ea555f8ead78bf3ddb383f3e40
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=at+the+quinte+hotel+poem PDF link annotation
    • https://khogiaydantuonghanquoc.com/images/news/file/dudujakasigajidagugevan.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/9415030961.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/30403094186.pdfIn PDF document text
    • http://dobermanncz.eu/files/10658293651.pdfIn PDF document text
    • http://riondene.ch/img/uploads/file/35320294770.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/22741795962.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wijagovijupiwewafumuxu.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/87621359164.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/gelevudeluxuxevow.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/73201069995.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/79189169918.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/86473687744.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/33912806184.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/kodevuvu.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/79012090527.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kibezemojabefu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161668e42288a9---fodoluwudagoxu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/74888934055.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/69767685023.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64152515928.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/25201933256.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/50879166729.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/24527978027.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/sanoruvogewigokidalovoweg.pdfIn PDF document text
    • 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_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 20700 bytes
SHA-256: 150b8f500c959c336f69da21003905a9103189e41fed8c3d8824e81f79cbe725
font_01_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 10316 bytes
SHA-256: fbc0730306210d03a437b294da858e0b661f5e4a169db8631bbc21d8bec3cf5e
font_02_sfnt_off00016db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1