Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b602e74dcc8fd67…

MALICIOUS

PDF

78.5 KB Created: 2021-02-18 16:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb5a73249b9c498ec42fdb2c06d832d6 SHA-1: d4098d605989f6819242fb2c311550a34d5c91b9 SHA-256: 7b602e74dcc8fd67c73aaadd2c4d9c34f09e5db45fde5c07d20eee0ca4865513
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://seumenha.ru/strik?utm_term=should+the+word+professor+be+capitalized PDF link annotation
    • http://faromobipon.22web.org/37241518550.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/butiloro_lenej_jixozu.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/20414175666.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/6b35a4fd8140f00.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/tolob_bamixixufeked_mirijamadix_vabefimes.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/newodesib_nulutakowelopi_mezezado_xabizovavi.pdfIn PDF document text
    • http://doresal.22web.org/3d_whatsapp_gold_apk_free.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/1fc5fb7dd.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/jawapomuxumog.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/kezizixobivis.pdfIn PDF document text
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/8104192.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/3e5b4a87609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevorewububew.epizy.com/bufigilegowuviwodeves.pdfIn PDF document text
    • http://gedamodeges.epizy.com/sincerely_me_sheet_music_free.pdfIn PDF document text
    • http://tijemimujajig.rf.gd/xosepifizirusunapumekusek.pdfIn PDF document text
    • http://volegurez.rf.gd/40749455863.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/lafudoradewodibukapa.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_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 5628 bytes
SHA-256: b760a8429783dd9d3e1a1cec279609b72168dccc4f583ade3d4526d649d62380
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10832 bytes
SHA-256: c478cb9a3cbe19b80e075db66ca23fa96227246caf0aef7c34f33616bdbc9766

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