Malicious PDF — malware analysis report

Static analysis result for SHA-256 d140a08f81d5dc6d…

MALICIOUS

PDF

79.7 KB Created: 2021-04-02 06:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7be2508c5ce9c24acbd444c359876d9e SHA-1: 5340fb815c643411f9808859077038316b3a29fc SHA-256: d140a08f81d5dc6d070118c9e01dd557a5afe18504dcdf2aacab81a463e5c428
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://vilenefex.ru/wix?keyword=let%2527s+golf+3+apk%252Bdata PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446174/normal_601b0f479e0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6024196232348.pdfIn PDF document text
    • http://indital.space/how_to_put_rainforest_jumperoo_down0v13y.pdfIn PDF document text
    • http://cleanup-sale.site/babavotilokn5stx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_602084eb6af57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_601be128097b6.pdfIn PDF document text
    • http://instapriz24.online/fadetisasudarufu705rd.pdfIn PDF document text
    • http://center-about.com/49782120148wa3as.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/democratic_centralism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_605f0dc79717f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_604d7f957ab4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_6021a5b2b0a2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453100/normal_600796665bd23.pdfIn PDF document text
    • http://cybety.xyz/pamigogpjjn0.pdfIn PDF document text
    • http://didazema.mypressonline.com/data_science_from_scratch_second_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_600d2d6fe500c.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/e51edf78-9453-40a3-b89e-8b415976b712/que_es_canalizar_espiritual.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/nagaxipemot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd76f09-feac-4b67-953a-5a5b936c3423/27323670735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286b9516-5499-40ee-881a-bc73473929bc/dr_browns_bottle_warmer_e1_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4e3099-969d-46ac-83cb-01a3fb36b9de/panasonic_lumix_fz2000_fz2500_amazon.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/beatles_help_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1d0f07-508e-4f09-89f0-f8fc4f1e8c3b/how_to_set_up_comcast_xr2_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17902be-71b0-4f81-81f5-43a2a3152dab/29048534918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abeb5f4-31f6-45eb-9569-7cdd4bbd0bd4/best_free_dd_5e_adventures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 2960 bytes
SHA-256: ffe008f00bdab04e42d0fb58581e94ebe343bab047a3ea3be819508d06260cf3
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5316 bytes
SHA-256: 67164980eab492fe02493d7e8e486546bd1b79cafa20c2bd749c632bcd4ccc3d
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 11364 bytes
SHA-256: a4cdcd27f5ff74c538ea84b07c13df934852d60ac151b05f96215f1b34a61c1a

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