Malicious PDF — malware analysis report

Static analysis result for SHA-256 b263b5db845e24d9…

MALICIOUS

PDF

77.9 KB Created: 2021-02-13 05:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f026c990940ca0f7cbe6bc23dac6d97b SHA-1: 97d85a2566dc2c5fd4d6dc0cb73f670cf2272e0a SHA-256: b263b5db845e24d90afab6a030da3e6bc9cf635a87698be950786c6aa0a65912
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'free pdf' downloads. The embedded URLs and the PDF structure indicate a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=medical+medium+celery+juice+free+pdf In PDF document text
    • http://in-arenas.com/rofazogedusabawiebcqa.pdfIn PDF document text
    • https://wetikifavuzimol.weebly.com/uploads/1/3/1/6/131606122/rujamuxepezuj.pdfIn PDF document text
    • http://housefashion.ru/marc_jacobs_shoes_size_guide974ty.pdfIn PDF document text
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/jugaz_vasub_wipakavudo.pdfIn PDF document text
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/4561141.pdfIn PDF document text
    • http://fortuneocredit.com/94600088684f777u.pdfIn PDF document text
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/kimegadubowovow.pdfIn PDF document text
    • http://kudatikixobulan.22web.org/jupumibuvusowa.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/wanoxizezimilesura0i293.pdfIn PDF document text
    • http://lofitner.buzz/46332632099lgqq2.pdfIn PDF document text
    • http://fenellalucynelle.info/73334175298gwj7b.pdfIn PDF document text
    • http://yoga-italy.space/ejemplos_de_alcanos_ramificadosdnxff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 5308 bytes
SHA-256: 9f506f89b59d44f57bbf9b28f7597a147afe1bc2bcf19a4aebd96467dd20f8a7
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 2052 bytes
SHA-256: ea10ac11888e4c3a17eadae41f90357bc42b38d0373901c6a6c174c4234cab70
font_02_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10908 bytes
SHA-256: fc5b7182f02fe50839fde6a86e4ae94915eda06f8314f82ebbb963d3559ec394

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