Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21e2c1d3b286b59…

MALICIOUS

PDF

84.3 KB Created: 2021-03-20 08:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5630cc05dcd99311116e09441455a46e SHA-1: 97828db847c00885d735875b4f1ae7d48302bc39 SHA-256: b21e2c1d3b286b5998f14b176a2b0a65febdac33cc48d1a28b154f8278bb56c5
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 0.9998

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://nipisod.ru/strik?utm_term=palm+reading+in+hindi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60155aad30fbd.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/hrCja8t/punemal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_6002f9646e86f.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/how_to_write_a_good_review_for_your_doctor.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/3464329.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/genie_intellicode_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/hjhbxnq/86933373219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489993/normal_60524eb91b6c0.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/jgegdlq/70157891640.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/nojasuvoxapa-jagivoluv-besewanebosav.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/does_vroom_negotiate.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/biruwokizetovi.pdfIn PDF document text
    • https://nafutitis.weebly.com/uploads/1/3/6/0/136053715/fc7c18d24134e.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/mulisunuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f08cc92-181c-40fa-b631-2a802b94faf1/71067679121.pdfIn PDF document text
    • http://mufizepumu.rf.gd/gakujoxeselekovaxuvusaz.pdfIn PDF document text
    • http://sedopati.epizy.com/55298574879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2fef13f-3652-4b05-a783-c254ba2598f5/15767762292.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5276 bytes
SHA-256: 97cfbef81f488c71aa9f3dfecf266e1fd09ce86e2b3ac3f2bdd6a77052fb5b5c
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10360 bytes
SHA-256: 8fadf9d9c3af762b422ed175cc04fc29532a19df12a19dc1cbdf1310759414d9
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 13336 bytes
SHA-256: 093381c59356bd51265c470c04c23345f640edccfde1657d90401d45cf61269b

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