Malicious PDF — malware analysis report

Static analysis result for SHA-256 228587c56bda6b95…

MALICIOUS

PDF

79.1 KB Created: 2020-12-25 09:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 05b9dafbe9ecaddac512c38474fccfe0 SHA-1: 911e0614af0ce6b2f300307467c69c50af39cd56 SHA-256: 228587c56bda6b950cc368724f490a8e87bf16f8df64379495c3faccbbcca0a4
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 0.9998

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 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://trafficel.ru/strik?utm_term=grow+heroes+vip+idle+rpg+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407784/normal_5fa56d0453afc.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/zuwunozafapajew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8e159a875a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386620/normal_5fcc4e261d6e5.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/f12ca41e608794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fce910a6396b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fcd1a0096a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fd9097f40085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f876e50757a1.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/lupebesu/adobe_acrobat_reader_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/methanol_formic_acid_alcohol.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/asphalt_distributor_truck.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/what_is_ana_ifa_test_for.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/game_cheats_for_pc_for_hidden_city.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 5620 bytes
SHA-256: f689afc2242ef34d6ae2de80464036f8cb110c509a549165578a61b24a52d72f
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 14724 bytes
SHA-256: 677a1ec8762a83ed4122286e1f9024b4e5cdaa1905015541904035e2094b8c65
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 16116 bytes
SHA-256: bbf267bdf4ac853042b967417f4f5c1aa22afeb20001dc0c34f122ab84a6e6bd

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