Malicious PDF — malware analysis report

Static analysis result for SHA-256 b456c0b3837657b0…

MALICIOUS

PDF

65.3 KB Created: 2020-11-24 07:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6771dea883a30e8b2caca6e5562adbd5 SHA-1: 1a1b4cec5b5ef2c266d1a2aa5f31e34249049b16 SHA-256: b456c0b3837657b0c9ef1cd58578ca712298f03ac5cf6b22961a9ad933dc5efc
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that acts as a redirector, likely leading to a malicious download. The document body, though heavily obfuscated, suggests a lure related to academic content, consistent with phishing tactics.

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
  • 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://traffset.ru/aws?utm_term=structuralism+and+functionalism+in+psychology+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f91efa299dbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f8c0b4815f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f908c0f9b36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f942b3fc2247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_5fad7de26d008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f9cd1b8d2ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f93d739ec1ee.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/453e7fbb-020f-4ad4-93d7-af309dd6aa06/newazol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67e5abd-2003-4587-b509-dbc3c1f59177/lugetitatukowir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbad9947-08d6-48c9-9da0-a412060c375d/26015080578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cb461d-ffd0-4c2b-a9ea-57ecb9861683/werner_theory_in_coordination_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/angularjs_example_application.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/oblivion_mods_ps3.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/water_cycle_worksheet_6th_grade_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/26013893470.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 5

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_off0000c4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AA 5776 bytes
SHA-256: e4963c31acfb03e45a33f39e670a1cfe8af22f2d57bb37d6191d192d0efed89a
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 9392 bytes
SHA-256: 207dea7c63c852483db0c04ea6c8cf0a731e7d8e0ddaead94a5ba4c8802a1af8

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