Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef4d5c4660908fa…

MALICIOUS

PDF

78.4 KB Created: 2021-04-27 07:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6846ef7bbb85fd63f34888b28cfc0d69 SHA-1: 21743b72f33a4f6be7da0a033af54a59834c303f SHA-256: 7ef4d5c4660908fa1b0114c7259eeef6ed0d178dc1bf10e449195dbb64826bf6
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://xezojetit.ru/strik?utm_term=movies+like+king+of+thorn PDF link annotation
    • http://medemukiduba.sportsontheweb.net/coaching_registration_form_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_601daeada7156.pdfIn PDF document text
    • http://sopidemeleket.mygamesonline.org/clinical_embryology_textbook.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/24049065011.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/91740602697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_605617ef421b1.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/joterige/bleacher_report_epl_fantasy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6088139e-050f-4908-9f32-3f9d517ef686/cateye_volt_6000_front_light_review.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/alopecia_feminina_tratamento.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/how_to_unlock_safari_bag_lock.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/44839456708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27276d0a-ac75-4c12-98d6-257811f87b8a/71718445938.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_66760b62258345ebab637e709434d8a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d756b584-da44-4c75-b039-977a2f051506/simpson_3300_pressure_washer_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e812e8b1-6b3a-4543-909b-87538dc54093/joint_stock_company_in_india_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ccb89d-b408-464c-8b0b-06f079e9b49a/is_zero_zero_zero_a_true_story.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_91edd8cc61b64629a1f2ea2fc6d6344d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/xitowuzixobesere.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 4948 bytes
SHA-256: bf7ff4dd1e6ee01c5608df83604ea1a320f5106aa75b8eeda0a7b7301006c14a
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10472 bytes
SHA-256: 0b0b57502219354edfddc642edd3feb5a347977bd7cb8f0412c5204057850143

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