Malicious PDF — malware analysis report

Static analysis result for SHA-256 972d9147ab683280…

MALICIOUS

PDF

61.0 KB Created: 2020-11-10 04:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 577aafbdef35be385f11ea4461cfdb2d SHA-1: 341b85e953f19baba1646d51ebc61ace5c755995 SHA-256: 972d9147ab6832804e5eec6b676060c3fd5ec0c88d8b32a5f1c3cdf06edbfbb2
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure (traffine.ru). The document body, though heavily obfuscated, suggests a lure related to 'congruent triangles proof worksheet', indicating a potential phishing or malware distribution attempt. The presence of multiple disposable hosting links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?keyword=congruent+triangles+proof+worksheet In PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/5297435.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/2ca4dcb14d4f0ff.pdfIn PDF document text
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/76782518932.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/d388211906182.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/dunijojivisilezuw.pdfIn PDF document text
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/tebutuvegiduvaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fa1f1de22b9a.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/e201acafcc.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/ladojenefe/85601781423.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/fancy_pants_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/risasebonelikedoke.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/fedopinovubuxilasumixizo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/21023019007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f3cf41-76cb-4cf5-805d-ddb420dacc9f/91522237431.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 5224 bytes
SHA-256: 824856e83d6c9e3e9e340a9be8522629e216cbd1916ee3482ca17695210ad0d6
font_01_sfnt_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 9768 bytes
SHA-256: 0f41966984191b1934955a0ac6303e2979c75ee884dd195a46afc98e19f9417d

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