Malicious PDF — malware analysis report

Static analysis result for SHA-256 503c6fa6d7257274…

MALICIOUS

PDF

78.9 KB Created: 2021-04-05 02:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e0585dc225fe0687e174f55e773e29f0 SHA-1: 9c634b00bc8fa8a4e83ed475979839a7b6611074 SHA-256: 503c6fa6d7257274829826daea392324630c60b38df6f9951cd41154748f918b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=progress+monitoring+online+self+quiz PDF link annotation
    • http://zozilejumulis.22web.org/magugep.pdfIn PDF document text
    • https://nimubawelekuf.weebly.com/uploads/1/3/4/2/134265751/fbad7df1dfd60e5.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/wixijuwodumuzut-ponirozubi-gonesalite-buxekameru.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/49964965070.pdfIn PDF document text
    • http://mnatural.space/70870074636crtu7.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/jotanajodof.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/67837613144.pdfIn PDF document text
    • http://megatorg.ru/39731215968jr1uu.pdfIn PDF document text
    • http://beautytopshop.site/fatumadasefobul3q1s1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd3a43d-16c1-427f-b99f-f2f00623fba1/kezufuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fcabca-252f-4847-b8a5-ba64807c778e/kenmore_elite_washing_machine_error_code_f11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbecf034-d3bf-4fe5-bac0-93309e61fd0c/khan_academy_free_sat_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/gevilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bd971a-5cb5-40f7-9d99-f4731369825a/lasko_ceramic_tower_heater_with_remote_control_ct22410.pdfIn PDF document text
    • http://puzuniposodaf.epizy.com/44187556547.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/ruwokikajogexefivuzaxixik.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/78924760096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e7afc9-ec43-46b5-b581-c6c9917881b3/difference_between_qualitative_and_quantitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/26727655463.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/hillsong_united_awesome_god_sheet_music.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 5056 bytes
SHA-256: 760bf8e652351d3e3b72233eed32a343768a4628ee619ac5c8829bc5d691af14
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 10712 bytes
SHA-256: 8fdc7c7df2ec19de6eb11ba8c57df468d441bb79c201014d7d5c564699ca3f55