Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7785739b906113…

MALICIOUS

PDF

72.1 KB Created: 2021-03-29 17:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6b95177517c73cd9168da488fd471cc3 SHA-1: 1500a66302d0a8c758b527b8bb403a9a93f50161 SHA-256: be7785739b90611341db7a577ee3d42c74a9e498418fe9d00f3387e4080ffec3
216 Risk Score

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. It uses brand-impersonation credential phishing. 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/jibuj_xosofuwajafad_zefizagunorab_xaresogezewaja.pdf.
  • 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://resalured.ru/wix?keyword=glencoe+earth+science+textbook+8th+grade PDF link annotation
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/jibuj_xosofuwajafad_zefizagunorab_xaresogezewaja.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jhihhd6/vintage_police_car_sirens_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/geijieg/zombie_3d_fire_shooter_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/b1plUVl/maleledederedevifu.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/5256447d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/galinikagopit/43368906942.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/netonazefurewisitov.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/pantangi_pambalana_worksheet_grade_5.pdfIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_925aad24a64546a2b997fbc03f510787.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/alchemy_meaning_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/muvapuveguxaz.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_f83597a289bd46b78a31afd801f178ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/48533071035.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/71313399941.pdfIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_ead19030f0a9487d82226262ab32d560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/99864745291.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 5488 bytes
SHA-256: 1505cac7ebff9253148ea8dd3fe89512c8ce6874cc06ca2801c65a4b96a9fec8
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10588 bytes
SHA-256: dd31a093f6ff10a8f92ea4c14645bf2e7f29f06b086713deee1fd2b75c15852b
font_02_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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