Malicious PDF — malware analysis report

Static analysis result for SHA-256 85053bbe4cffb94c…

MALICIOUS

PDF

70.8 KB Created: 2021-03-09 15:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ecf42b07634df7bfdb4bc95cfb615f7 SHA-1: 5ed86562aa6cc983b741e58c790e504810f0be44 SHA-256: 85053bbe4cffb94c8e424991a638649adfde03bd644ea6ae48068e6f6aed825e
156 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. 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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=singular+and+plural+possessive+nouns+worksheets+pdf PDF link annotation
    • https://cdn.sqhk.co/pumafuki/jicY4ha/rowadirip.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/fuW7kid/zowetitedigejanapude.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/ee203ea37857c.pdfIn PDF document text
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/zazadifusedufix.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/462eebbcff6.pdfIn PDF document text
    • http://vugijow.iblogger.org/minn_kota_power_drive_ipilot_reviews.pdfIn PDF document text
    • http://nesadurem.22web.org/pumedudozoleverufezal.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/duvasibopukemuwim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_6cc8f231aa8146e59c5314c2056d4486.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_82341502020e4d91a1b4750bd4957315.pdf?index=trueIn PDF document text
    • http://josuzilepetuwa.rf.gd/brooklinen_luxe_core_sheet_set_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/tanejinofif.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/recette_bellouet_conseil.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/gimp_fr_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/59462565475.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/jasperreports_server_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/34962937930.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/74577462660.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/australian_passport_renewal_form_child.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_82202c9d1fa645ef88483c21ee2d4c56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kimone/body_building_status_video.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_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 5624 bytes
SHA-256: fc91c4633187e7535c6b46f7cecd9a7a814a523c8d316a38d9e55a505f0c5af8
font_01_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10084 bytes
SHA-256: f698c5aeabc50cbfb27de9aacacb26eefa8e6a80edc874ae3d44c760e537bcba

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