Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8ff9769b4bc78f…

MALICIOUS

PDF

82.2 KB Created: 2021-03-02 21:52:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6edcac7b8699625536aac74ab9f372ee SHA-1: bdaa74ef77927935428794dea4e3f9669135cae5 SHA-256: 6b8ff9769b4bc78f1126dcdc68712a20bc7e7dd28b9b27fe335b6938249add0e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=java+unsigned+byte+to+short PDF link annotation
    • http://netzamka.ru/100_year_calendar_2000_to_2100xsqpd.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/zuwut.pdfIn PDF document text
    • http://petersikdar.com/87954715674y6ttv.pdfIn PDF document text
    • http://gprofights.ru/how_to_make_a_large_wooden_malletbklf5.pdfIn PDF document text
    • http://zesamoa.online/what_is_the_exposition_of_decameron1j3ui.pdfIn PDF document text
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/viwonorufukiselux.pdfIn PDF document text
    • http://feyakast.online/vepoditelodutagixuxufizakawn5g.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/57021293177.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/zarusegibitumet/sea_of_thieves_macbook_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/29850710126.pdfIn PDF document text
    • http://zalikizo.epizy.com/centrica_plc_annual_report_2005.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/76127596420.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/97349232370.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 5344 bytes
SHA-256: b8639ba0ea97c02af5337d001c152e0a5073277607555f756c6980030407c538
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10140 bytes
SHA-256: 1a2d85dc9534fda31601d0ea4edbc9b0087b797112727c4b31d5b22f5a7ca61a
font_02_sfnt_off00012562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12562 16088 bytes
SHA-256: a1804fab7033f1d251fb29e732c1b9641fb316f4dad76a6f11c561d626689051

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