Malicious PDF — malware analysis report

Static analysis result for SHA-256 368777217cc69766…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 18:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c421c4e2cf8c984bfdfe2488f4663c1 SHA-1: c8b3fb5a7bc542c3c8f766d02d53b6fae54838f9 SHA-256: 368777217cc69766971c5c14f7baaa61824e910974b9c12fb6ea2855aed66b85
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and points to a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=the+alchemist+full+book+pages PDF link annotation
    • http://gift-founder.com/archive/upload/files/10300841215.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/19455945244.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8884d0baa922a75528ed77a054bc0b54/10688668012.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/12291291418.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea141e28e1---28386174301.pdfPDF link annotation
    • http://heaig.org/editor/ckfinder/userfiles/files/fitawa.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/konebiwetamosu.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/repubijisuxunufubum.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/bemazoxadepavolo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/99107297012.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2ec2e13313b1ad2e023c808d26f26257/41977248228.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/68170409798.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/lupolifawogodo.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/karizorafeparapafabi.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/42362372488.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/31766093747.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/foboju.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/banugatejaruluvod.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/repafimol.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/vijowi.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/98686631977.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/24856667622.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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 11016 bytes
SHA-256: 01d4292b582411738c6952b1d57e1d181cd3d2781a32d2f059b8854c324f0ae1
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 18788 bytes
SHA-256: 77dec05c82dbfb4a7537961cce8cd72829502669c62862df3cb90eab09060e9b