Malicious PDF — malware analysis report

Static analysis result for SHA-256 98aa0e5887bf00c8…

MALICIOUS

PDF

81.7 KB Created: 2021-03-17 20:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 691210ff81320fe6989d7b7d233a6d6c SHA-1: 252dd36a937b686d15776b192cdc613f11bebad5 SHA-256: 98aa0e5887bf00c8d9d681548b462dba588ee3d5e53ffaeabcc56f1cf27637cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to domains that appear to be part of a link farm designed to mimic search results for academic content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL `https://ponafet.ru/strik?utm_term=introduction+to+quantum+mechanics+3rd+edition+solutions+chegg` is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=introduction+to+quantum+mechanics+3rd+edition+solutions+chegg
    • https://cdn-cms.f-static.net/uploads/4455380/normal_601a4a05669c4.pdf
    • https://cdn.sqhk.co/pajokiman/cjeegi2/42545310280.pdf
    • https://cdn.sqhk.co/bafujifi/byWhexq/rital.pdf
    • https://cdn.sqhk.co/benanejufa/Sfnhdgg/nubigudorov.pdf
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5ff081d3565b1.pdf
    • https://cdn.sqhk.co/zegofurop/e1Ubsgd/leap_of_faith_movie_quotes.pdf
    • https://cdn.sqhk.co/wimiwupo/igiiRTz/76535384190.pdf
    • https://cdn-cms.f-static.net/uploads/4475392/normal_5fdc368d6caac.pdf
    • https://static.s123-cdn-static.com/uploads/4426687/normal_6006c53e4aed8.pdf
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6042d9579ff30.pdf
    • https://cdn.sqhk.co/bitowiso/Shcjaib/maguz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_6e38d29afee8422f9334af2a62d2d9ff.pdf?index=true
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_a413da4572704e1daa2ae9e6cb8e1cb8.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/47377914929.pdf
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_6f6e235cc9574bcd8fd418170a660d0d.pdf?index=true
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_5b4a28e254d44af6b3c0e08a429087c4.pdf?index=true
    • https://s3.amazonaws.com/xijilesuzuxo/wipuzerurokip.pdf
    • https://s3.amazonaws.com/julaxel/84329328066.pdf
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_f52e57f4a4c045798fa78337a8ecb6ca.pdf?index=true
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_375e6cb237de4b07a7abb0fc1a904a56.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_301ccdae83fb4ffebb53cb0efc28420a.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_4a0af07a0e5d49d280e30e97ecaee136.pdf?index=true
    • https://s3.amazonaws.com/mexesazaxasa/android_wear_version.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin
0640ec6727403544e29662860c2d6d587146536743f160a454f42505fe5c7ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5580 bytes
font_01_sfnt_off0000fe96.bin
1656c36969f28630b3081ac80668395db1dd2cf11eb85e88fb5866255d57e89c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10848 bytes
font_02_sfnt_off000123ed.bin
3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 16084 bytes

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