Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35886149f2084ed…

MALICIOUS

PDF

70.6 KB Created: 2021-03-12 18:38:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 319419face6df8c4b8ae3b26ad31b9d8 SHA-1: ab9ad56cceae5a3be2e091e7ca278e273109fcda SHA-256: f35886149f2084edfd0453ddb7cb46bbbef4f2256a6767c324d6bf16b538b93b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://kuzutuzo.ru/wix?keyword=sig+sauer+m400+owners+manual PDF link annotation
    • http://vijofudevadotar.mywebcommunity.org/91332271033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_602861ca2952c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fed13de1d27d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fce6925265f1.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/gawowelajigodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_6048d4ba38a4b.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/lowofazezomap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_600c70aa6b547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_60324e232b881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_5fcf82a5c405c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_601f5425ccafc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6022cce9b36f1.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_is_the_message_behind_the_national_anthem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe51c0ca2655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenezonel.rf.gd/easy_english_conversation_dialogues.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/28838103111.pdfIn PDF document text
    • http://gotupodejepu.rf.gd/14895017353.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/instagram_video_views_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/bouncing_ball_game_for_nokia_x2.pdfIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/11266970216.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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 5428 bytes
SHA-256: b77027df2948e29e0c2b06a9f12057ccda9d1cc5d5b0c52db9cc8b7b9d411703
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10388 bytes
SHA-256: 7f84ce89f779102e08e55745b2cb92b5e29e4dbf0874b0c98b685a7feb8581f2

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