Malicious PDF — malware analysis report

Static analysis result for SHA-256 188d709c747c9f06…

MALICIOUS

PDF

71.4 KB Created: 2021-03-15 02:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 261eaa186ddd54b3b11f038078275bcb SHA-1: 55a864a9edcb1d96fc8f0c82a0661009f2ddb343 SHA-256: 188d709c747c9f06c8915736b15fb6febca581474f647951a84884d8ba026bc3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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://botokaw.ru/wix?keyword=ap+chemistry+review+book+pdf PDF link annotation
    • https://cdn.sqhk.co/lenawemijixe/M3nBhay/dessert_ideas_with_cream_cheese_frosting.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/gVigagg/jeparilevikolikused.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/hblmig8/space_force_logo_netflix.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/c2216ad6134e.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/bezorito/ccu_full_form_in_telecom.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/silk_thread_bangles_design_images.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/harga_batre_notebook_acer_aspire_one_722.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_6052cd2d02d649b5a15268e806b1b345.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec5896b-bdd0-4767-acd3-ec796185f646/72191716226.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/android_emulator_not_connecting_to_localhost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1a6864-f00a-48f1-a74d-8e2f377f2f71/wilujewumalulogovigobufo.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_414bcd75e14e43bdb65ae8f389eeb8ad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 5600 bytes
SHA-256: 71d7dd39484d6a522e38624de4cdcc938f4ede20a71898e648df0249e19d6e1d
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 10900 bytes
SHA-256: 4a370dd1867b9355fe326c059b76ebb7eba152c66f2ff3007be02f89115ab267

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