Malicious PDF — malware analysis report

Static analysis result for SHA-256 f989e1ae59b96b1c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 03:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bcec8c2de48a52cc25d059af21e90a83 SHA-1: f47e3c91c2f625397e76d592dba894a18b5ba78d SHA-256: f989e1ae59b96b1cfe52a5715d5ca9c0564c8b4c9569d4a97b4aa7733ac0043d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=robin+hood+john+escott PDF link annotation
    • http://phamtrangia.com/upload/files/jesugovojopamipaxofuwi.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/18366932551.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/26659647296.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/wesunugivufe.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/23875929682.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/10301987547.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kedakaratabosuneje.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/28996685389.pdfIn PDF document text
    • https://vientangluc.com/upload/files/29125862248.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c82bd4a1942bd3ca87d7eeb3ad870930/74723107732.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/rinaxuroresasugekoropu.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/xarozuwogaxe.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/1405195501.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/veranifimifuv.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/92126963012.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/33284077976.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/50490946070.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/55492565815.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/lomufogopenepufesi.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/28756614486.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23554060745.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/sodaw.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_off0000ac70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 16608 bytes
SHA-256: 28f089a06c330bac51572b60f2e36bb2fb6e9eee7c6b6ae22c65113627b735b9
font_02_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10476 bytes
SHA-256: 9b666f39b80e3041e49fbed17d612509fa386832c7e9b5f60048bf682fc6e797

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