Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e819bf7aa0c62a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 05:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b3b42085ff22e3aeba4b2c574ac9ea8b SHA-1: 2c7c7ea47bb668ab053c39e7bfa4ef25f1169ad3 SHA-256: 57e819bf7aa0c62a935834f493091175a4877c31a34886b18447e9791432e078
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=applied+longitudinal+analysis+fitzmaurice+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412773/normal_60247bec8e08c.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/8386952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff7b8515b89d.pdfIn PDF document text
    • https://vukajikabazaxeg.weebly.com/uploads/1/3/4/7/134711597/xarekiraxozado_nofotu_pijadon_zobumed.pdfIn PDF document text
    • https://vubumixot.weebly.com/uploads/1/3/4/7/134751696/804a9e48323216.pdfIn PDF document text
    • https://cdn.sqhk.co/firavibaw/lTjhFgf/buserejakorefen.pdfIn PDF document text
    • http://help-violation.com/how_to_clean_biddeford_heated_blanket24hio.pdfIn PDF document text
    • http://cucoupon.info/wu_tang_american_saga_season_1_episode_7hz1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_602e36eee39af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fc5cb4b853fc.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/tgeoa9T/how_to_get_zombie_slayer_doom_eternal.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/119c61af.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/DQ7yjcc/52024510573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pegalisijeg.epizy.com/90611193431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a6ac39-d742-4a6e-a571-097ddadbee8d/47712962793.pdfIn PDF document text
    • http://furizebun.epizy.com/free_banner_template_png.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a7ee67-2b2b-40ed-9b91-9cb965db4783/exponential_organizations_summary.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/android_set_background_color_programmatically_hex.pdfIn PDF document text
    • http://seviboki.rf.gd/android_programming_for_beginners_2nd_edition.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 5616 bytes
SHA-256: 4add99d489fa6d14c0ca940b513669c53e2d5bf812054ea70dd5539b72cc7df7
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10924 bytes
SHA-256: 044987804affc35eb4fdc640d093c3c3428120ff0397ed80328e35c2da70ca2d

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