Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ec08a82f4887b8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 00:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcd13fc6b66448fc019060aa58ab4474 SHA-1: 209948aae2ecb1a19516d54189611ccc9bf42eae SHA-256: 48ec08a82f4887b80aa2a0afb562a0eb32718712db08c3ad75f2cc140430f3c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The PDF structure and embedded content suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lamachine.nl/userfiles/file/86402579196.pdf In PDF document text
    • http://ingegnasrl.com/userfiles/files/74985266599.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/32857783700.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/1194754798.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/sijaba.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/dedorepu.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/demijatiguxajilomefore.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/zoluxebob.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/direpeminuxa.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/19682015465.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/rojoxedasumuzixa.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/31637018990.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/77466298104.pdfIn PDF document text
    • http://vejwun.cz/images/32656609558.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/jukaji.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/bukubopo.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/45736965412.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/pefajexapatusesiwepozi.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/ruwakumojuzuluzigo.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/42482553156.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/51500084715.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/puxazerodunojuta.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/pezigubexinejepu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/19938434146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=subtitles+in+mx+player+onlinePDF 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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD093 16256 bytes
SHA-256: fa2bdcba0248cd2fdc5e91bae695c553031ab2a6942b9a7cd66ae34b292d772a
font_02_sfnt_off0000fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4D 10944 bytes
SHA-256: d9c8dd33b89112599c9c2876b6776f55afa1ad48383f653075a8ed8295107a6b

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