Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a429663bc3e522a…

MALICIOUS

PDF

69.1 KB Created: 2021-02-20 19:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 51accdda9b0ef01cd467beb96ae1cc0c SHA-1: f1fb46cbea4fba15e2fa14f7829c5173763029cf SHA-256: 7a429663bc3e522a8706c763dffd5df369df2279b4aeea56d07808999f67e814
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the high confidence score and critical URL findings indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/wix?keyword=sidemen+the+book+pdf In PDF document text
    • http://physcoo.com/retrograde_pyelogram_proceduretsqmh.pdfIn PDF document text
    • http://gesizuwumog.iblogger.org/66545020028.pdfIn PDF document text
    • https://gataveboturifon.weebly.com/uploads/1/3/1/1/131164486/c0a56a1f5aca5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5feb5fa8a366a.pdfIn PDF document text
    • http://sidixul.iblogger.org/elasticsearch_bulk_update_performance.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/3983462.pdfIn PDF document text
    • http://bostpolamos.site/make_a_call_with_wifi_calling_android8ncrk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fdf24ce10b4b.pdfIn PDF document text
    • http://ru-dev.xyz/mr_guns_n_gear_facebookesu0g.pdfIn PDF document text
    • http://mozodulo.iblogger.org/tazojeruliberusazine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dumizalu.epizy.com/dazegofumatubu.pdfIn PDF document text
    • http://mibovemijo.rf.gd/balanced_scorecard_powerpoint_template.pdfIn PDF document text
    • http://kidogip.epizy.com/tijofuzedotarefulibajiro.pdfIn PDF document text
    • http://funuduki.rf.gd/85556507446.pdfIn PDF document text
    • http://fabupumow.epizy.com/47371139197.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 5072 bytes
SHA-256: 995751d05e08349b698e63da2414ee1aa72ceea734990d901c8c9a5cb7ca4712
font_01_sfnt_off0000e519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 10136 bytes
SHA-256: 8d49eeb682b66ff6750f5ebed2aafc584ea3dce41e584723c2e2697fd4bc9bd0

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