Malicious PDF — malware analysis report

Static analysis result for SHA-256 404aeaee6c90ae09…

MALICIOUS

PDF

69.6 KB Created: 2021-05-03 09:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6f54c76864d56cfdfde618bcbb43c8e1 SHA-1: cbc75f1e6c94b645979a9697225c4d3c7ee4d4ce SHA-256: 404aeaee6c90ae092fd224febac2222f2309d868c45c5b4d6dd5fd8d2c6a07be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, likely intended to redirect users to malicious sites for phishing or malware distribution. The embedded content suggests a lure related to downloading a technical manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=css+the+missing+manual+pdf+download PDF link annotation
    • https://xuxefakeni.weebly.com/uploads/1/3/4/2/134234722/4026031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5ffaaa33d386c.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/jolixusu-xarozu.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/ruzupalosajuxe.pdfIn PDF document text
    • https://wufonujixu.weebly.com/uploads/1/3/4/3/134386315/doxezejarem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476927/normal_5fef47d7749d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_9928a5f848b94b6186d3d2c63559121b.pdf?index=trueIn PDF document text
    • http://kuvevaxumo.rf.gd/fairy_tale_bedtime_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/13779951974.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_a5df5b5d53804126b4c45f4d41a407c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be04bf5-f002-4ecc-8bba-decf94214e21/100_g_harina_en_tazas.pdfIn PDF document text
    • http://ginisanekuxowo.epizy.com/bawevojavojawatef.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/imagen_de_carita_feliz_animada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea4970b-ba83-4328-8bbb-645f53918a56/92000679948.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/budesonide_nebulizer_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142a4c4c-2fd9-4545-b237-0b30e4a9e9cb/the_land_of_stories_the_wishing_spell_audiobook.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_2adf2678d8cf413999a2e845687a553f.pdf?index=trueIn PDF document text
    • https://8717ace1-8174-44a1-9f98-e7cbf9e9ed94.filesusr.com/ugd/14e3be_4a6d53d709d249a2b97286a9dd35130e.pdf?index=trueIn 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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 5356 bytes
SHA-256: 8dafb46a305f85278f3ceb80845472f9d6664f1e3a60fc3f3654107f66687dd0
font_01_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 10196 bytes
SHA-256: 1967aa9e7458deebe500191a5d890e06201bdf91d4c4f31e72003fda230b9f7d

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