Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b76309afd312a09…

MALICIOUS

PDF

113.6 KB Created: 2021-03-28 00:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0b4ac45e590aa1fb2db0bb13b058f196 SHA-1: 5b42523033b5ad7c1e5359019f99c8c84c7c1c05 SHA-256: 1b76309afd312a0981a41c5731064cfbf7e1a6f60f528ebc8c7bd2e3448627db
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 0.9995

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://pelibifir.ru/123?utm_term=saira+narasimha+reddy+movie++in+tamil PDF link annotation
    • https://cdn.sqhk.co/wenisuvuroju/chcu5ue/one_punch_man_the_strongest_guide_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/icsG5hh/minecraft_exploration_pro_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vegapagir/futjgjf/ralphs_annual_delivery_fee.pdfIn PDF document text
    • http://awpmode.com/spoken_poetry_tagalog_about_lovenf1jb.pdfIn PDF document text
    • http://insurancecarusa.com/apollo_twin_x_usb_vs_thunderbolt11d6u.pdfIn PDF document text
    • http://themarkuzmusic.com/376875615729qykl.pdfIn PDF document text
    • https://cdn.sqhk.co/jotoselu/ajcqrv2/oregon_weed_farms_jobs.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/751b96a.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/a34966da15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefebewo.epizy.com/chiari_malformation_basion_opisthion.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/critical_ops_free_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/6642960521.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/59784899334.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/56107134103.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/wixabusuvokuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/date_format_php_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/maxogumola.pdfIn PDF document text
    • http://depegiwisa.epizy.com/spotify_premium_apk_2019_ios.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/nasuxatudasesaxobikur.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/tidupinu.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
    • 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_off0001680d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1680D 5328 bytes
SHA-256: 1c0284a44a5fc113388ae4f0c2b7f3444498b3db5f890811e2b45cf268c92794
font_01_sfnt_off00017a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A06 11912 bytes
SHA-256: 45915a090afbf4bf44e0958209d9761d5a0e5af537112fa4244afe2e29cdd551
font_02_sfnt_off0001a2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D9 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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