Malicious PDF — malware analysis report

Static analysis result for SHA-256 90686a51c4d401af…

MALICIOUS

PDF

79.7 KB Created: 2021-05-14 07:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e32dabd800b0673e68b8233a8beb6983 SHA-1: b1b84604ea90a6c8c0c69a475b8652d48f857444 SHA-256: 90686a51c4d401af595a9e82699b49c124c1950043482cd48ba09e831fcf6327
126 Risk Score

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 0.9998

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://midufefew.ru/strik?utm_term=stairway+to+heaven+guitar+solo+youtube PDF link annotation
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/7875662.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/TigTgiu/class_8_maths_syllabus_cbse_2018.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/81387746488.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/6721883.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/a7iaial/boxesanetamoteb.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/integral_calculus_problems_with_answers.pdfIn PDF document text
    • http://dajexori.mypressonline.com/chemistry_of_building_materials.pdfIn PDF document text
    • https://cdn.sqhk.co/bebiwamulanu/iGhdU22/red_herring_argument_meaning.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/lisinowegatobiko.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/P3Mgeii/surgery_master_game.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/pawovogaxugavix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofijiserige.onlinewebshop.net/applied_psychology_notes.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_ce24a4b40a4d49748a7853d1c42ce5a8.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_10b510d79b354f4d87b823860a9ddf15.pdf?index=trueIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_abf20cf1fa3f486697a2a90616c93385.pdf?index=trueIn PDF document text
    • http://zerujafulo.rf.gd/fuboberotedezovifo.pdfIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_5ac7b6cd9eda4a70bbf1a0fbef1b50f2.pdf?index=trueIn PDF document text
    • http://lujovaku.epizy.com/learn_to_draw_step_by_step.pdfIn PDF document text
    • http://vijesir.rf.gd/72999421403.pdfIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_5ca21c548b594fd0a9615d3790e97940.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_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 5444 bytes
SHA-256: 93dd31ec776dcef17758643635f70e149ac0918082bccda861ebe0e2e9809c41
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 11100 bytes
SHA-256: 66f783e79a95341058fac2b13ae348a90d6a1e85c3868b270e5b142d4b8dda13

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