Malicious PDF — malware analysis report

Static analysis result for SHA-256 327f3c7226388754…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 19:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 58f3228b70287e785434520e5f5a8991 SHA-1: b661b0cc758c8c2ff84edf45a102010adc7f9485 SHA-256: 327f3c7226388754ed20f972bff8cb9afcc4f8b1a2929ce65e8ea3c1fbca4f32
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick users into downloading a password-protected archive, likely to hide malware from gateway scanning. The presence of numerous external links, many pointing to PDF files on distinct hosts, supports the link farm and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://taptigrihnirman.com/singhania/downloads/file/80353404091.pdf In PDF document text
    • https://remini.hu/userfiles/file/25161122871.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/80145981195.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6033185269.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/kopijus.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/mokolerezu.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/vofijisufofi.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/labexofovivutudakesoreve.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/xejidikolodusineboda.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/30238065688.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/651387836612f0aad8f863.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/84929545489.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/27969102122.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dotisaredojo.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xunuwiremagotig.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/62940278514.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/98075760523.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73964379470.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210903193325.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/29691995332.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bfd603b5---gurobabugafovu.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/44627267531.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/96751387400.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/wujuximebevutotap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=psp+games+download+zipPDF 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_off0000bdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC0 10684 bytes
SHA-256: 2f249304a86dda73ba75ef7268dab86915562db3f65a2d4d44999106ebf69afc
font_01_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 15780 bytes
SHA-256: 072f70a3833ac92b0819c48f1766ec32f7292b0abb74d36b694f5a0435ad1fdf