Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35e3f615e4b0968…

MALICIOUS

PDF

93.9 KB Created: 2021-03-16 04:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16db275e9f77479476cbffd7d1cb798c SHA-1: 98d28a0c8d73e7a56bb46ef7feffb3890913ef93 SHA-256: b35e3f615e4b0968242849421bb5f653886c7b231bd1cbc900849eac1df92012
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 0.9993

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
  • 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://ponafet.ru/award?keyword=cluster+grid+computing+pdf PDF link annotation
    • http://zolomakowifop.iblogger.org/grammaire_progressive_du_francais_avance_3e_edition_corriges.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/xajewiwinuzodu.pdfIn PDF document text
    • http://tenefadapom.iblogger.org/manualidades_de_corazones_con_papel_corrugado.pdfIn PDF document text
    • http://volazanuva.22web.org/xipavetumotunatisegazok.pdfIn PDF document text
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/2bf4f94ef329.pdfIn PDF document text
    • https://luwosixikitap.weebly.com/uploads/1/3/4/6/134628352/f2ea90.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/jiweraxugupafenako.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/movasodibasalefuriv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/aggregate_spend_reporting_jobs.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_530223b420464018b00ab5443c488199.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7a6d8f-9b00-4167-b9f4-35cb6f2cac37/star_trek_the_next_generation_season_1_episode_26_dailymotion.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_710617d4fe7945eb8e2db6d50f499d53.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_6a55f6a9971b4c6dafa2e95fa00050c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/45900582861.pdfIn PDF document text
    • http://nibuvidi.rf.gd/metro_2033_chapter_2_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/bumblebee_soundtrack_mega.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_2c7ff107b8d2457c8900eec9f5f961c4.pdf?index=trueIn PDF document text
    • http://senisiluni.rf.gd/in_christ_alone_piano_solo.pdfIn PDF document text
    • http://mukukukeban.rf.gd/gyriform_diffusion_restriction_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/55004766875.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/45644253688.pdfIn PDF document text
    • http://nejukiwipe.rf.gd/rasutanewefagopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b3ff82-be45-4667-a536-1d83a7031554/guvufap.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_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 5172 bytes
SHA-256: 51503cf40bd6d3b2f9fbee81c23fad855db8f74f0e8dee7adfda5942ece380d6
font_01_sfnt_off0001442e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442E 11176 bytes
SHA-256: 8c12faac331496eece45939844e8f6662ce34996982bfe08c18ec44ab63a55e7