Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d56a7fff9476d50…

MALICIOUS

PDF

76.6 KB Created: 2021-03-06 12:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 19971b96b83124532aedb09eb934533d SHA-1: 34053b417d5fb7a1abcc6fe8bb542ec4a02ed912 SHA-256: 9d56a7fff9476d5037dd9e22ac030703db9ff5ea29c1a5c32021bfbbb8b8a0ed
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 hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=who+makes+the+best+adjustable+bed+base PDF link annotation
    • https://cdn.sqhk.co/zesozote/w8gihf6/all_crowd_control_games.pdfIn PDF document text
    • https://xavivovumerut.weebly.com/uploads/1/3/2/7/132741007/rugime-pazenewi.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/ioEGggK/ding_dong_hide_and_seek_japanese_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/jeYjjif/telegram_and_gazette_worcester.pdfIn PDF document text
    • https://wabomojufodeze.weebly.com/uploads/1/3/3/9/133999178/822a60a1941ce.pdfIn PDF document text
    • http://bbflowers.net/45355611597tic10.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/lalowadenar.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/62047052826.pdfIn PDF document text
    • http://bellissimo.online/mary_poppins_musical_album0v4fg.pdfIn PDF document text
    • http://mobile-media.moscow/json_format_in_confluencec7mk1.pdfIn PDF document text
    • http://criticcxck.space/how_to_use_porter_cable_air_compressor_to_fill_tiresvcdf6.pdfIn PDF document text
    • http://fabermanufacture.ru/30420452407p6fop.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jMShcmF/clash_of_clans_th7_base_trophy.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/cjMRWUs/fabafetosejixar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_7a259f9dbe124378974cc25448f9e157.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/29513301040.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/duet_premium_edition_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/aforementioned_information_above.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/bekirato.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_4b58f972e26b4a1e8bc79295c25a26bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/jalelebol.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/4264069248.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_5a6d6029ed024d4586ead433d72cff0a.pdf?index=trueIn 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_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 5260 bytes
SHA-256: fc75ddb704b3d4df579252eb2c384221bf9f864ca56ea9c73045010d30209f49
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10212 bytes
SHA-256: cf79a08c254ec28c9182e8b8d43c1f41e75e85ada7ffd3eac4f6287139a812e8