Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78a8f3a4e1efa37…

MALICIOUS

PDF

67.1 KB Created: 2020-12-10 20:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3db171031645d3d67b2497370e2a1e8d SHA-1: bee000e5b97372e3108e65ccb8ee34cdd5e4d68e SHA-256: d78a8f3a4e1efa371d58a0bc4c91ac829c24a8fab031d9e87e44416819bbd3e4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with the primary suspicious URL being 'https://traffnew.ru/strik?utm_term=blackshirts+and+reds+epub'. This indicates a likely attempt to redirect users to a malicious site, potentially for phishing or malware distribution.

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://traffnew.ru/strik?utm_term=blackshirts+and+reds+epub PDF link annotation
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/jumufojid-maperuxale-zuxatapipelew-nudegomek.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/4731b4.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/nezapu.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/dosax.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/1429627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf5518bc8713fe6fd0c38/1606219090829/janajoviwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1830524c-7cf4-4405-8a33-0ba791d2cc85/poxiwavulugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245184d1-cd09-4ed3-b1d0-62b4a8ea2a35/as_cinco_linguagens_do_amor_para_solteiros.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0bcbedabee7b44094d75/1606224844235/ancient_greek_jewellery_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b168aa9e-ee38-4f1c-aebf-8d2875f7355a/limited_brands_aces_etm_scheduling_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773d1e92-2915-419f-8eb3-4b365cd81ca9/sapiens_senai_org_br_unidades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add9221b-cbfc-431c-bc3e-754ecd9b266b/dsactivez_le_systme_dautoprotection_avast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a7ccfe-e1c9-43a5-aa62-5a0a24c942ba/80118092957.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 5416 bytes
SHA-256: f9db66d3af713d0733a87127915c7a7e5d4a500d4ced042b42875914c2f2577f
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10476 bytes
SHA-256: 6a07f84d9d74f201045188316a6b64900936611598b0187662ae8594afb41f9d

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