Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fdc965e089dc3c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-17 16:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a11a3f1963b7f23e225ef7d1041502df SHA-1: 507266deee1540f7d4b7223407ed60cd7b78b043 SHA-256: 97fdc965e089dc3cd3ce9e32830f594cd1cff352abc068390a7c2491e2d62d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its true purpose, which is likely to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wpscrm.in/uploaded_files/userfiles/files/13626254941.pdf In PDF document text
    • http://zuche0551.com/upload/file/69833661907.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/noraxosejog.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/57553897859.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mawobedokef.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/53154028229.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/44122224858.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/vofujopenixurikav.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56524691391.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pilovugowesuworug.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109131706405820.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/kutoruri.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kagumivo.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wokasadubifune.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/94246173174.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/redodirek.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vokepuluxudisil.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zakirixo.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/70542755236.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/9033308743.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161357d02a8aee---laziravoduxor.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210912061324_1080259082.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/31578353610.pdfIn PDF document text
    • https://theipbuzz.com/images/file/dolodudenokofigepipisosa.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/90776047845.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m3abhuvvvtmauel0jls9fl9npk/bavoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=merchant+of+venice+notes+pdfPDF 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_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 18824 bytes
SHA-256: 9636d62ee68f2cafe06eacbb452de7bc5a1941c7dac8ef8c4eb3decbebc6469d
font_01_sfnt_off00012c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001447d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447D 10728 bytes
SHA-256: 911b6bca2fa3443ee5714bd1f39862c2c5b36d0922d8bb0a73ed05bb03a82edb