Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d22b2ea575bd97…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b73eb9c359949641b253bf773eeb73c SHA-1: ab4b35886a88b11a80d2fbf633374c6186822621 SHA-256: 05d22b2ea575bd97e380ab4f24c080ea6f1419f43f73cbd9bd5c65c172479984
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests an attempt to distribute malicious content or facilitate phishing. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic to bypass gateway scanning by instructing users to decrypt an archive, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://giovanninociti.com/userfiles/files/1932076482.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f6742341---92000239745.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/93084396543.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/luvonuxatat.pdfIn PDF document text
    • http://carbontuning.ru/file/74879541119.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/54627305099.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/56060557948.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/zadejog.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/rupupejejavako.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/4132033187.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/nijijepelerekowofefanaw.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/62364907384.pdfIn PDF document text
    • http://atya.eu/files/file/janeromavurabuju.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/fikojul.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/65741392495.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c787ec2f6c---xetepasusurewonodox.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/fodot.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/dibafemuxe.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/74119590757.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/83405865373.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/92384271932.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/xukuwirabavenazufob.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/48671839449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=delete+temporary+internet+filesPDF 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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 10636 bytes
SHA-256: 27f5a9261227f1a9abf7681233aa63a93d6b04b8eff6644610545acb20ca5f69
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17648 bytes
SHA-256: e066275de28d60d407e6b28918f0050ec945572f86ec428cb50fe6fb37bfa2e6