Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e4b6b094bc2894…

MALICIOUS

PDF

78.2 KB Created: 2021-04-09 01:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 666c5754bd22b06c62cc4366260b2f37 SHA-1: 12ae9502a18bee4eb106e847c373c554d3677b49 SHA-256: c8e4b6b094bc2894cf3ff6d4e03aaa3dfdbf6c7e5b61f035e2ad1be94c7f3edb
156 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 0.9996

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=wahl+cordless+hair+clipper+set PDF link annotation
    • https://zugexegepu.weebly.com/uploads/1/3/4/7/134740595/titemarexiba_wavupoziwilub_gusuzabe.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/gekojupibakitevim.pdfIn PDF document text
    • https://gaxifuxizuru.weebly.com/uploads/1/3/0/7/130739475/mebizim_tizofapopexin_perigodemexif_tadoxaviwaf.pdfIn PDF document text
    • http://moreprodukti.com/kpis_sample_templatejfuqz.pdfIn PDF document text
    • http://custits.space/futipumuzivinimulolo35hzw.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/9973b.pdfIn PDF document text
    • https://tulijibukabez.weebly.com/uploads/1/3/0/8/130814483/vedibuvajuno_sivikupamupujud_sosebufema_fewelud.pdfIn PDF document text
    • http://citimart.online/gartner_orlando_symposium_agenda2u6ah.pdfIn PDF document text
    • http://probnik1313.tech/pawimofadivuta53wdr.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/617817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_756c02832ec743c3b988ea96b539886a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojenozap/how_to_do_big_7_long_division.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/2006_suzuki_boulevard_c50_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/ms_word_table_practical_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/30214420982.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/gapisozelisipigu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/28401151428.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/buzepikefokexikov.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/zazijipidox.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_df2619b34cfe49a18a80c7dd1626f69c.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_badad489c9d24c9ca2a2e56ed5d9a343.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/xepigibebi.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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 5176 bytes
SHA-256: 7e9748c817ff3443eb7b60bbb5fb4859ae659280672952a9b4abe74ac3de349e
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 11644 bytes
SHA-256: 6b07edd3440a4af716890e417a616d3583ec932523d5f42d1539140e1d189ab3

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