Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e982976a771a403…

MALICIOUS

PDF

67.7 KB Created: 2021-09-09 06:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3652b8b9fe12fef98b90aa38888af731 SHA-1: 2bd3f3761f191e921dede17da91f1fb9bdd28ea2 SHA-256: 3e982976a771a40348ab94ea28c948589c5898938bf3c701c644653fa464ca2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adtw1.elfjane.com/ckfinder/userfiles/files/43539637327.pdf In PDF document text
    • http://dichvuhieuchuan.com/upload/files/81501460268.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/lurobenaxisivij.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ronutojekufopediz.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/xajote.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/sazufotivotuwafasujobod.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/ziteralerudepijenun.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613621cfca908---sibodinerok.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/lipudaziralasababesijib.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/69349302787.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gudas.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/sogew.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41728863314.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/sidosumogi.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/15292654625.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/fesaxupukopek.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/11f4da05ebe5f6bec9c8e996d9ef6181/84240945566.pdfIn PDF document text
    • http://aa-nusd.jp/80840071068.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/24947351887.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/17670491272.pdfIn PDF document text
    • http://www.520amis.com/upload/files/52158679906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clash+of+clans+nulls+apkPDF 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_off0000acf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF3 10380 bytes
SHA-256: 31ace0ca457d45a069aa7eae8bc6d9517baba18dd43d031fba95052873cdb9e0
font_01_sfnt_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 14356 bytes
SHA-256: 9437a2baa9a7d436362be5cf998a3bf75bad061baead41c563ff2b5b83567363

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