Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5945257d38dd50c…

MALICIOUS

PDF

109.7 KB Created: 2021-04-02 05:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5851ecb7bb14081ff2ffd1deb6e137f1 SHA-1: 29c3e9128359dc8a13fa03775429da3fa71c820f SHA-256: a5945257d38dd50caede6798943e79511a3be34cd9cb9a18899acaf8bfa7811b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains numerous external links, with one specifically pointing to a suspicious URL that appears to be part of a link farm or phishing campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://midufefew.ru/wix?keyword=t+fal+optigrill+stuck+on+manual PDF link annotation
    • http://solent.bar/how_to_use_humphrey_visual_field_analyzerujdxd.pdfIn PDF document text
    • http://ru-order-687646765445.art/520909138568s044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_603a7ac9db602.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/aOyjjOa/2434287051.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/djcHjjh/popijasosax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6058bb79430ae.pdfIn PDF document text
    • http://winoraama.space/wetopepitujezigimutud76ljo.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/qx0jbjh/75161684684.pdfIn PDF document text
    • http://wonnaturila.space/wonatozutiratinapuwism47t3.pdfIn PDF document text
    • http://myirn.icu/furibagigifzvbr4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fe38a625b3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fe7743b9d34c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_249a4d7c7e3649e6838e42e387a97cee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/cutter_insect_repellent_sds_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/tokyo_ghoul_seasons_in_order.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/g._i_sheets_for_roofing.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_a20a9cb8f9fe46bfaab239be7c4c5d1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/business_information_technology_jobs_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/tromm_washer_code_le.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/6649197397.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_5d002375215c4e9bab430c1629a52a35.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_2294ff7572df4120b9903edb7d8b418e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/k_letter_whatsapp_status_video_sharechat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 5348 bytes
SHA-256: 6fccda5c941c008cee66381fa3f233030c986bbb70538c0111e8a7f4b346be16
font_01_sfnt_off00016c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C5A 11712 bytes
SHA-256: 3ae7cd4a603eac24a4b0b44b17fa66a93fc73959aecb6b6796bf07b138b24983
font_02_sfnt_off0001945d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1945D 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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