Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f46571d5e309465…

MALICIOUS

PDF

77.3 KB Created: 2021-03-29 05:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e442da1d9ff80920c389dcc42cef5ae1 SHA-1: c8ee3769a96914085457e09b5312cbe0ac479164 SHA-256: 8f46571d5e309465e5cc49ddf5e8d95223a61d1b6c326555c1f8f204c50df8b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=cuanto+es+1+4+metros+en+pulgadas', is identified as a redirector, likely leading to a malicious site. ClamAV detection and ML classification confirm the malicious nature of the file, indicating it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=cuanto+es+1+4+metros+en+pulgadas PDF link annotation
    • http://lnstagramverificationbadge.com/ppt_templates_free_microsoft0qyv3.pdfIn PDF document text
    • http://kawlites.online/16391399243n1arm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_600afade1f27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_6040d557471a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_603fedf4410f1.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/59f994b83dc6.pdfIn PDF document text
    • http://lidzadva.xyz/cursive_writing_file_downloadmt1or.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/mit_electronics_course_online_freeyyahk.pdfIn PDF document text
    • http://iranianvc.com/how_to_apply_the_art_of_seductiont5bdy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fee0d4a52ca9.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/2f6b5.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/pusori/basel_2_document.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/33609957569.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/film_directing_shot_by_shot_-_25th_anniversary_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8b7bf7-084e-4c04-ac32-e71670b9f913/94744695165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98057c3e-d946-43d3-900d-daa289adc52e/how_much_does_trucking_school_cost_in_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/zakuxomesaretafatezumerif.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/11008479246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fcd82da-a862-4fdd-b59d-a35160cb0338/songs_of_innocence_and_experience_poems.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/how_to_reduce_belly_fat_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/41337396703.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/how_to_sync_onn_wireless_earbuds_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/61208248324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0bb15f-f456-41df-b34a-9a7cbeaeb5a1/41899135853.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/despacito_free_piano_sheet_music.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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5324 bytes
SHA-256: 731f33aefcd4621f35661a23efddfa11a79b530067c90f18935da74cf9759325
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 12332 bytes
SHA-256: 2e8843a039238d1fee1cf0139374b7f4b7ba18c62b012b154422958979b8fc18