Malicious PDF — malware analysis report

Static analysis result for SHA-256 69159776a1654a78…

MALICIOUS

PDF

75.7 KB Created: 2021-01-05 07:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31fda5386d93c49d6bb4cd5446ac8e91 SHA-1: d48cdc44a8cb52516fad53c3209dd404a92c4c90 SHA-256: 69159776a1654a78bff9339059f4d25a6ae009461899792c206b15decba52c46
126 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous external URIs, with one prominent URL pointing to a site that appears to be a phishing landing page. The PDF's structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffnew.ru/123?utm_term=nurse+practitioner%2527s+business+practice+and+legal+guide+%25286th+ed.%2529
    • https://setivegubuwo.weebly.com/uploads/1/3/4/4/134446573/4030916.pdf
    • https://niwewuvikade.weebly.com/uploads/1/3/4/6/134629185/todefumuf-dupatomu.pdf
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/lopirev.pdf
    • https://static.s123-cdn-static.com/uploads/4463538/normal_5fca9ebd5292f.pdf
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fa519b83eae6.pdf
    • https://cdn.sqhk.co/kisunika/ieMrhbY/the_impossible_quiz_book_crazy_games.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/liledabirapedozorir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nafoxuda/17531403353.pdf
    • https://uploads.strikinglycdn.com/files/e4ca96e7-b5dd-46b3-a1fa-69da91407000/enna_nadanthalum_lyrics_in_english.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/85635688977.pdf
    • https://s3.amazonaws.com/retisovojor/alliteration_practice_worksheets_high_school.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc23.bin
85343e39ab8f6ba1cc4c3c7fd775f32fd0388d5cbe4a631533d10cc476678b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 5700 bytes
font_01_sfnt_off0000ef8c.bin
4ee7b9b3bd04725d220756a81d0b79d2807e2250ec2cc15aaf2e3bb6ab64c44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10940 bytes
font_02_sfnt_off00011362.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 4324 bytes

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