Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f302ccbb9fe64…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 23:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 938571187ef9cd264980cf44ff6190d1 SHA-1: 134eaa048b4f32e4dc6a8e0200a84ea8ffa6991d SHA-256: da3f302ccbb9fe64c94e53474bca140aa7651917d9c8175c6eed5239eb252599
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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.
  • 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://resalured.ru/aws?utm_term=3+1%252F4+pulgadas+cuantos+milimetros+son PDF link annotation
    • https://cdn.sqhk.co/pipujevi/gg9Hohd/26388569634.pdfIn PDF document text
    • http://uose.xyz/how_much_does_it_cost_to_study_mba_in_malaysia5ydmw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5ffdcb8e8701a.pdfIn PDF document text
    • http://brosbass.com/84468625013isi75.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/fjdJ92v/99465524625.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/hagifei/73846526752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ff19d24e95d4.pdfIn PDF document text
    • http://lyudi23.ru/gebaboxktzg.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/idihGji/26462203987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_604919e61d489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_604affca4d6ce.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/PnA4Wgc/gymnastics_training_center_rochester_hills.pdfIn PDF document text
    • http://copytoshka.ru/18183297458nisr6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_605a0a7511188.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/risisipajole/23256482265.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/ronodawepawiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785ce872-e502-468c-8b87-67bfcb8b2850/36891921667.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/i_90_94_wisconsin_traffic_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75796bf-b52d-4361-a9bd-16b7311f93af/once_upon_the_hill_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/daxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/blue_jackets_coaching_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5010239-6b8e-4174-8708-e7cc2267b0e3/nizanaramotolakemaduso.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5640 bytes
SHA-256: b0a0266c17d15548da261b339cb847086c1511b3e5e42db2d50800a1b6acf3dd
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 11908 bytes
SHA-256: fa7ca25ea74e7190c2f98d3ce34682b3c3e459d12cf73220a6baafa106dac3ed

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