Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38634590fedd140…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 10:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06c5b2703738efe5712e24f6817d4f9f SHA-1: fc7a84bf11e49483cb0ec0e441273d1aa3097957 SHA-256: b38634590fedd1400730213341cff9cdfcbf302439a304d4985a5353af29ac4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, embedding a large number of external URIs, many of which point to disposable or unknown hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://travelworld.ro/userfiles/file/76161172748.pdf In PDF document text
    • http://tech-in.info/bramy/userfiles/file/jazezavovezodi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151e0a0af434---55911748938.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/12012509570.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/vixegapitijike.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/63848340284.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kapawitusuzoziz.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/14017728892.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/61255572391.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/ludepapipakajigo.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/lijakepeveramaboworopix.pdfIn PDF document text
    • https://jin-ji.com/upload/files/55978739409.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/pafagamigalapok.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210912_7D28000C987CA290.pdfIn PDF document text
    • http://ned.ru/uploads/files/poxig.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/40636455386.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/bubevanisi.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/45513904537.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/43503397703.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/28707902267.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/79793892588.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/velavipisefovikej.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/kezurekivawufibamibijirov.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/xexowika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hd+bike+racing+games+for+androidPDF 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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 15740 bytes
SHA-256: b758a5821149892a38405e32f1b5120b4ff5a7bea9851ad5d88223498ae35738
font_01_sfnt_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10896 bytes
SHA-256: 1cad728fce8b61c1bc42cfcbedf711b82a5b9f1467e672d1f1a664f1f500bd67