Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c8edcf9b6d341c…

MALICIOUS

PDF

67.3 KB Created: 2021-03-01 00:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 973fa01be8d2ded00cd4a5c45735c00b SHA-1: 7d4862038003c4ec6957c230e2714ff793d572a6 SHA-256: d5c8edcf9b6d341ce40d454ad138476bcf3f23b3b3fe34b7f5f1f68334c0efab
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one pointing to a suspicious domain ('golowaki.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

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 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://golowaki.ru/123?utm_term=how+to+use+accu+chek+control+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470226/normal_60257ad12d305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602f70be0f977.pdfIn PDF document text
    • http://verexexomebot.iblogger.org/gubomafofekezajezogivixof.pdfIn PDF document text
    • http://hookup754.fun/803582276937mvkq.pdfIn PDF document text
    • http://petersikdar.com/child_abcd_video_songsnsn3n.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/hlL4gf6/hide_and_seek_korean_movie_explained.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/ha5X2hg/tujigikunirono.pdfIn PDF document text
    • http://center-san.ru/para_que_sirve_la_linea_internacional_del_tiemposh2h6.pdfIn PDF document text
    • http://jotipire.iblogger.org/21610515287.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/zikeko/tijifomaxuxagufusiv.pdfIn PDF document text
    • http://jixetumoxefa.epizy.com/que_es_un_lien_release_en_espaol.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/70812874382.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/burnout_car_racing_game.pdfIn PDF document text
    • http://kanomovezizof.epizy.com/69810130817.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/lohengrin_prelude_to_act_3_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/55925855403.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_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 5004 bytes
SHA-256: 4fe60879ce655fa61ee1f5d75a50037804f99fe35a05c835dd6b3ea03249d99a
font_01_sfnt_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10772 bytes
SHA-256: 97ec12cf80325c3b6399b60b774a013721b6be277bd1afa7b85f4fbe327fe319

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