Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36797a05e1f9f50…

MALICIOUS

PDF

67.6 KB Created: 2020-12-01 00:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9f692f2c9af1b66e6027441ba8da1f10 SHA-1: 5f852c32bb81a04e3f7628536b282d721c41b6d1 SHA-256: a36797a05e1f9f50d78e19b79a07be7b5c2eeb9ff3be302162a10c10cbdd0bc2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Tera archer pvp combo', suggesting a targeted phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/strik?utm_term=tera+archer+pvp+combo In PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/nimezewisobi.pdfIn PDF document text
    • https://xakukanezo.weebly.com/uploads/1/3/4/8/134898234/7118ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f95829cddadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f9ba4789ffd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc12df85bcb0228a284406c/t/5fc2c6c83570fb44d15eac44/1606600395005/vevafifosotezusepunizurad.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/wewakefa.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/75657355667.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdef4cbc819f1cf49d6ef4/1606283084955/51743912888.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15a4327a199023ab881d8/t/5fc56f7e173fb5383b5b742f/1606774654800/penawolisorebijuwobafex.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/21222772614.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/pawijiwaxudaku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ec6c8787e879896c16ae/t/5fc13462bc819f1cf403c3eb/1606497378414/48555951346.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_off0000ca16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA16 5112 bytes
SHA-256: c0b155e86d2fb1e510da7f2694f12eff67ac1e6bdfe8699b930e436bbc5e77e5
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 11640 bytes
SHA-256: a4f5d43b2a0346bd6e2f929da3525269c8cfb6afea298167477f6831176f96f1

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