Malicious PDF — malware analysis report

Static analysis result for SHA-256 534ec7841a150d1b…

MALICIOUS

PDF

78.4 KB Created: 2021-04-01 06:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 24764b4638a606852da9a4f6b2822b52 SHA-1: 995b9a7fd001d0dfc7c60ab89499c92320c8ca7c SHA-256: 534ec7841a150d1b0d9e327f8bc84a38107a1854b8547d9935d4b12d6134b1ea
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It employs SEO link farming and redirectors, specifically using the URL 'https://maypoin.ru/wix?keyword=chapter+25+nuclear+radiation+answer+key' as a lure. The document body, though heavily obfuscated, suggests a theme related to 'nuclear radiation answer key', likely a pretext for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/wix?keyword=chapter+25+nuclear+radiation+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451760/normal_60633d9940c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_600f51ad60e01.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/9CigPig/30868143312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450042/normal_5fdfc564e3f8b.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/iP84d6z/74925162688.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/uibMmgh/todo_cuadros_opiniones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_60639e9aa0753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_acdf315686194cc589193c350ca861f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/wuwigifakixelemetapiditup.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_45e5f83e21d14e74b41b1431d9c33a10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/new_maskandi_albums_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/viewmodel_in_android_example.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_525ab67a21a544bc996010b439dd1098.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/fogulexaku.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/49948712407.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

Related samples 3

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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5580 bytes
SHA-256: c1491eb53b5475098138c7b855d3f92007f40e0eb1e24d2a2267d3bd3244c0c7
font_01_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 11996 bytes
SHA-256: 8c5a0ff8f0c77a339e3598773fc030cd0a3f13ca50002e0f461d7f43b8e0cd5a

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