Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8d1b4844d8f19b…

MALICIOUS

PDF

81.0 KB Created: 2021-02-16 19:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3be70fe36e3c6a9cc794e074864199b4 SHA-1: 47e038a64814af929aed2bf209600306dac93077 SHA-256: 6b8d1b4844d8f19b75e9a9d0456a955a6dd289e21a929c061603078d0def40c2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://bologen.ru/123?utm_term=tales+of+a+4th+grade+nothing+movie PDF link annotation
    • https://cdn.sqhk.co/widexerun/iaYVihK/simple_grocery_list_android_app.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/004b1.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/wizujuwukatez_naxupujene_fejowobim.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/qEwiia4/jemilekamesaxake.pdfIn PDF document text
    • http://ylyn.ru/derivatives_of_trig_functions_worksheet_with_solutionsphth7.pdfIn PDF document text
    • https://masodorenos.weebly.com/uploads/1/3/0/9/130969057/vixaw.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/tafesukisedo-fenuleli-fovoviku-kutufenakozobu.pdfIn PDF document text
    • http://littlenat.space/3912460341kpzge.pdfIn PDF document text
    • http://tehnotop.space/join_files_side_by_sideb9syb.pdfIn PDF document text
    • http://daddytestit.xyz/wekolebasifurimxmi7m.pdfIn PDF document text
    • https://woxufojobufuv.weebly.com/uploads/1/3/0/7/130739326/2202483.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/ihgchaw/wewokibo.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/WG7OgcW/kewerifijorererajifova.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/lazolu/chamara_weerasinghe_nonstop_free.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 8

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_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 5416 bytes
SHA-256: e1d3ef93176e09ccde145e12821c294c3e53310f3c956771d5ad69036e504005
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 10916 bytes
SHA-256: 2832bd9aa4d7caabd52a145ee0ef746bb3bfbd60316a7631cd10694bbddc215f

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