Malicious PDF — malware analysis report

Static analysis result for SHA-256 587900570757cbb7…

MALICIOUS

PDF

73.7 KB Created: 2021-09-13 11:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 40368bc008c541ad208341ebf4046462 SHA-1: 9c782e6c25d6a6cfff4b2a6ca50e270538c1a3cc SHA-256: 587900570757cbb7df4183f7b3d9b8ee11987a7f71562cdcafc9d14effdb65a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The presence of external URIs and the link farm structure strongly suggest the PDF is intended to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=offerte+smartphone+android+4 PDF link annotation
    • http://vdadanang.vn/app/webroot/assets/files/24191440388.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/bidefabemu.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/1909837376.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202191281181585.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/lakitevilafex.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sozamozid.pdfIn PDF document text
    • https://digiconelectronics.com/media/19084361360.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/ziborew.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/pibebipifika.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/xadelamitavixisaniwediw.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/pugenomozeje.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19245520617.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/tasirebetu.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/satozopemitirila.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/56892303236.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xowitade.pdfIn PDF document text
    • https://atlantidegattico.it/file/38753083289.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/senixatodeju.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/guvoxunogijivafifofoti.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/95926287812.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/59750690964.pdfIn PDF document text
    • http://videocycling.info/files/file/15352969840.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/dizimawel.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/soxesulogimibu.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/46841722462.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_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 10820 bytes
SHA-256: 337b7616dac800d4b1767d56cb57db7fa07fd73859d4c4570e53ac363dc9a088
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16996 bytes
SHA-256: 650ad7f5673234d25040051babe65bbd947509a5d1266b62a71cede3391e04ce

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