Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77a0842888a0a21…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 08:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 157b585685d880433e261ff99c5e0656 SHA-1: c9b703af78b54f06a816201fed0d119bda9df8a8 SHA-256: c77a0842888a0a21df1ec040650dd440c779e6e871c27a4047b3e0e7300d6f87
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs, many pointing to potentially disposable domains, and is flagged as a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be a pretext for obtaining a password to decrypt a malicious archive, a common tactic for evading security scans. The presence of external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=famous+composer+of+the+renaissance+period PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f3908f06---doliwaboxojuleg.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/680778184.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/boratatugapemivixaxez.pdfIn PDF document text
    • http://sivam.pl/files/file/dijapod.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/63290204218.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/26103368188.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/20953951511.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/98378067114.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/xopafoxidulikidopinomela.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/79598020465.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/raranedikefapu.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/24662363613.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tipefukorelunu.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gurux.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/mulovarene.pdfIn PDF document text
    • https://aildf.in/userfiles/file/zikebosizikaroje.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///8022400238.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135139832cc6---37931240790.pdfIn PDF document text
    • http://domario.ru/userfiles/file/pipujoluzosudor.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/kufajafesarerusalijeraj.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/74482553034.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/5617781231.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/52729765569.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/74484835546.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_off0000b239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 14848 bytes
SHA-256: d8203a4e7708136bd66bdf42b9ddb8ffa0862c501bda3e38f334ae1ad59836fd
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 10916 bytes
SHA-256: 9881a7c488b5903c2c1555b41ffb93b376e761447989ae8f18763fb995826836