Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cd877758dad35e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 01:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 543254fb8aafc8a35f45d8e6de0adf27 SHA-1: 2362d311b7734cf06c7eca3fe054793cea5f6687 SHA-256: b2cd877758dad35e5ddff5129b35fdae00eb0748131b8318581be4cdc99c2fca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mecateengenharia.com.br/ckfinder/userfiles/files/xojupofegalesis.pdf In PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jizizagivafup.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/55425814862.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780d41bd81---ridokobosi.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/muduxares.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/6398580638.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lijazolifowob.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/3734260653.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/43928592988.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/97175087931.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wevulogu.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/ridurako.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/rafunujovevuve.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d36617ead742cebff2f2fe8d526112ec/14537530123.pdfIn PDF document text
    • http://epicridesnepal.com/files/sosako.pdfIn PDF document text
    • https://unitjaya.com/contents/files/wodegiguvarub.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904003643.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/gopujerizet.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/14242582974.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/jefokunevurikuda.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/zafeboxegunozelawugo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nisasasovimoxifofovuro.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/fopavisopamos.pdfIn PDF document text
    • http://geotersrl.it/file/34096256465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+my+phone+keyboard+on+laptopPDF 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_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 11088 bytes
SHA-256: 17c148e61749bca067d3d133760ad19aee84e6ccc379bbb540dc6b62566cb923
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 17524 bytes
SHA-256: a69bb2567fa7c4ba2cbaec2e2958300141d9d96f299b2c9b4f1361c40da4ad1f