Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c82dd57eb6ab56…

MALICIOUS

PDF

72.8 KB Created: 2021-03-15 11:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9547311d089c3840a7877c478b232259 SHA-1: 556e008efcf2df16b29ccbeae254ae70fdd206b4 SHA-256: 86c82dd57eb6ab5647f83bb503c51dddd5f711b40e95fdad1f5a620fdcaa7abd
164 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=apk+editor+windows PDF link annotation
    • https://cdn.sqhk.co/vekuperik/sjj0hgJ/european_rowing_championships_2019_u23.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/ihj5ieR/e_pluribus_unum_eagle_tattoo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ibij1i6/pressure_washer_lowes_electric.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hbghmVm/off_road_racing_3d_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/geJ8N8U/dead_town_zombie_survival_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_602ba2820066e.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxijavapul/cfhjggV/video_maker_for_youtube_free_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5fdd29c25ad17.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/x6igihT/3215764575.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/2gjMDtq/78901559047.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/iifpKvT/5810971897.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/gjhcgjn/xoxuzovu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_82b8520085444ed3b7054873aa80ae8f.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_ea6297bf846245be90001ec1aa79f0f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/blacks_law_dictionary_fifth_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/binenipukofofag.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_off0000df44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF44 4856 bytes
SHA-256: c08966c53ef573831f42c3ab4cc4fdcb010777c4d34cb37edf75dea75130c7ab
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10972 bytes
SHA-256: 0e9502d008d0651590021f93f8bc568d56dd38f7159f95b58559589b0522ecc0

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