Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f9232237d4eb67…

MALICIOUS

PDF

78.7 KB Created: 2021-02-12 15:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61da63b7d52afe9fcb01970a0f8413b6 SHA-1: 34ebf2817be5a2632445fe6a8a9c6339b9de275b SHA-256: c9f9232237d4eb67e08347c3f5a57c96975fb48fcd20c2d3309b54d69b1f60e1
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links designed as a link farm. One critical heuristic identified links pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/123?utm_term=dig+dug+2+online In PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/2281411.pdfIn PDF document text
    • https://gixorinimomavam.weebly.com/uploads/1/3/2/6/132695995/woloxijupefusumo.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/dimagupu.pdfIn PDF document text
    • http://zogoxadaxagan.iblogger.org/5216641680.pdfIn PDF document text
    • http://gexafudotifunud.66ghz.com/donadifidikexuxovop.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/1407670f0f2.pdfIn PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/veraku_kumizilulinure_zisovubap.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/2201908.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufazireti.rf.gd/gray_blue_bed_sheets.pdfIn PDF document text
    • http://livukuxuperum.epizy.com/rotizapofenuvifebuneke.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/ssf2_v0._9_android.pdfIn PDF document text
    • http://fafinonez.rf.gd/calendar_template_january_2020.pdfIn PDF document text
    • http://wepezip.epizy.com/89885541926.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/p_g_figural_reasoning_test_answers.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_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 4640 bytes
SHA-256: 88b4cd5a8c08e7278d0f4015522b451aea25a4cc612ea4fb583af50f5f06ceb7
font_01_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 11260 bytes
SHA-256: e8d9d2c3f860f6965e609f7a69e4135c0efc9e6b9d824ba2a998f2416a8751f8

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