Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98a15dc74bd889a…

MALICIOUS

PDF

88.4 KB Created: 2021-03-23 03:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 25c33d0e30aa14a7bd67373fcf1cfc22 SHA-1: ddd0d74e6974d003808393a1c9f973f81fb5c1b8 SHA-256: a98a15dc74bd889a3125d4cd5811f282ef2113e96bc651031270ff3cc8c01981
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://resalured.ru/wix?keyword=tropic+of+capricorn+henry+miller+pdf PDF link annotation
    • https://cdn.sqhk.co/vibesadebo/jgheBij/fuvoxujenabamij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6036a2d9e637c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_604d49a86538f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_6029251f8251b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_60521d6431ff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fe3a5c2c80fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zowajomi/ogeBjeh/life_is_strange_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5fd3b3ad60f90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0379725c-9f38-41de-811b-75ffc3adef5e/how_to_balance_work_study_and_personal_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39752fa5-4d99-400c-8f05-c090cb705183/honeywell_germ_free_cool_mist_humidifier_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02bdb55-8091-4504-8a3f-6c7ee6861e38/are_marcy_weight_benches_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7602e4c-0153-447f-806d-42f53306cf7f/sojobapigi.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/lizexono.pdfIn PDF document text
    • http://nesuninabofoda.rf.gd/jijivirisaluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b049f8a4-9543-4a89-ac34-cfc989fcb994/lg_hbs_700_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/tax_planning_engagement_letter_template.pdfIn PDF document text
    • http://xadapokudenez.rf.gd/81018821245.pdfIn PDF document text
    • http://vapuzinejag.rf.gd/losasapekotabekozuwaxonug.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_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 5268 bytes
SHA-256: a8ec69104180e864bf7cc86ed5d3d849d02f12d711671c8066f18ad0d6602435
font_01_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 12392 bytes
SHA-256: 347539b3b9f9610770c7e47df7a010b475482228812afff67b3b0760ad006f8e

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