Malicious PDF — malware analysis report

Static analysis result for SHA-256 b739f4148d302430…

MALICIOUS

PDF

67.4 KB Created: 2021-09-15 23:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31f5d486d1beec55cef3709840a0e84c SHA-1: 02c82a920a38e95b8143a144ee6530b0317e79ce SHA-256: b739f4148d30243055e38fce3be07f92181c4d47221a54e451b61936f7c75788
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=vip+hotstar+download+app PDF link annotation
    • http://pradakshinam.com/fck_uploads/file/4105229352.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/79753862577.pdfIn PDF document text
    • http://proxima-design.cz/files/file/40289964036.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/jirajavopojakobar.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/32470894012.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/73938741877.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fawelojipaxi.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/2513035902.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/zomudokaragetogawujujuw.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/19450710140.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/retoxerimaju.pdfIn PDF document text
    • http://falerisztika.hu/tmp/26099914555.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/gezefuwabibatewumote.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/keduravadajiveju.pdfIn PDF document text
    • http://cwesp.biz/upload/file/mitetomiputazela.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/25247985844.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/41932777417.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/kakoperalukuzevogixed.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/10410227216.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q9hl031b31cg47m8unnq3va4pu/sajiva.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/44732652872.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/7740551411.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/radidifikamajovutebamu.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_off0000ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 14160 bytes
SHA-256: cfd3dac2101bb19279512a82cc30e4dd86c8e9d6d8910d08de68e0ddfe320ec9
font_02_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 10412 bytes
SHA-256: e65d1727208899ae618bf4cfb12237ab8128633cd39bafd9264665a4016cfe98

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