Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73e59eb23e488c2…

MALICIOUS

PDF

77.8 KB Created: 2021-05-18 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e231e342fa376010ad3c066a21177709 SHA-1: c184f4bf67e2fbe6f88464147fa7ab4e808f9e57 SHA-256: e73e59eb23e488c2695678cccaf8e91ead5996b2490ec0f94319f117b7e41393
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/strik?utm_term=how+much+is+6+oz+in+lbs PDF link annotation
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/wojusulonaz-lajuxebolu.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/tawax.pdfIn PDF document text
    • https://vixubarurumufov.weebly.com/uploads/1/3/1/4/131454397/01214850c8b3067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_60145e0d4af39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_6050f6e692bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6055217c280fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fded6a4a0010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_605f9b745009d.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/6aab14d155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_604ca070d8a88.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/taxonogozek.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/fajujiju/calligraphy_free_ebook_download_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/dont_wash_clothes_on_thursday.pdfIn PDF document text
    • http://puganuditefi.rf.gd/47835503990.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/how_to_charge_solar_g_shock_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/16220228534.pdfIn PDF document text
    • http://lavovexerok.epizy.com/40394618406.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/how_many_types_of_rj_connectors_are_there.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_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 5128 bytes
SHA-256: 8525b89f3c4e8647b8959fee7ff3621b89ebbbaae6cfff7ce214b0634dd31430
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 11176 bytes
SHA-256: db6a91668869df0f657e0c92e8f1c05e4486c4819366dfac6e5626e30a97b639

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