Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c9918fda27d407…

MALICIOUS

PDF

106.8 KB Created: 2021-05-07 19:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e9fc3ec4a7fbdc62968efcf664ff99d SHA-1: 90f498f218e34151894db3f77a136516ebf7b109 SHA-256: 87c9918fda27d407c25a79b2ba89c9f4fe4d5aa8b76e93a0863c6a1965ed63c6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://dafemum.ru/strik?utm_term=korean+from+zero+book+1+pdf+download PDF link annotation
    • https://bixevojug.weebly.com/uploads/1/3/0/7/130739122/99db21.pdfIn PDF document text
    • http://bigowet.xyz/best_books_to_improve_sat_readingxe38j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498986/normal_5ff95de5194b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491926/normal_5fe1c63e8bd88.pdfIn PDF document text
    • http://rmk4sale.xyz/76188893598ixt9s.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/nipomab_nogig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6042705c67f67.pdfIn PDF document text
    • https://mevemedetu.weebly.com/uploads/1/3/1/8/131871578/saluvadupede.pdfIn PDF document text
    • https://rumuzejisu.weebly.com/uploads/1/3/5/3/135349165/tijukijuli.pdfIn PDF document text
    • https://tuvonozesafuk.weebly.com/uploads/1/3/4/6/134600303/deruloraj_pobugewaripab_temaliven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_606217716f764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/bayer_healthcare_ag_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/how_many_carbs_does_wendys_fries_have.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_79daf9f58bb349a898cf1e74f6016603.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/robotevowegenarebujif.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/apc_smart_ups_2200xl_battery_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/writing_linear_inequalities_in_two_variables_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/jinopapuxelorovotoxo.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_2521e0949bdd47c1bf599c76fee54808.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_7c117347e70246899ae8c05d0b8aad64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/ravegiwikofugato.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 3860 bytes
SHA-256: b378eb192cc8baef229c98da01c8c548349f29e021f80958808653549b6c7660
font_01_sfnt_off000147c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C3 5376 bytes
SHA-256: 0f0e39e42196e63bade4f495bb8b5671f83759fb266b578160d77ee4694a36c4
font_02_sfnt_off00015a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A16 12980 bytes
SHA-256: 7503f7959975a022c2547af2e75482064cb9c4fe2af52c0f6658cf56223f796f
font_03_sfnt_off000184ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184EE 16544 bytes
SHA-256: 4688192b39003e8a979025e176be32a8984e33a9619bec20ad4fe9e4a74d7083

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