Malicious PDF — malware analysis report

Static analysis result for SHA-256 6670f211844f1d4d…

MALICIOUS

PDF

93.5 KB Created: 2021-02-21 03:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f4955f706f447527ee2fb46fbb34ec0 SHA-1: 9398b2dff5167cf1a029ab8c05efb62bfbd5efc6 SHA-256: 6670f211844f1d4d4d244e5b3058ebf074ee52ed2a0f7811777d07b0cfa1b32b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The heuristic firings indicate this is a link farm designed to direct users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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 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.
  • 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/aws?utm_term=what+is+the+relationship+between+wants+factors+of+production+scarcity+and+choices In PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/e415ff0a2405b.pdfIn PDF document text
    • http://speak4pro.com/23878487669zmrb0.pdfIn PDF document text
    • https://nixifekenebuj.weebly.com/uploads/1/3/0/7/130775280/vejotojoribil_nurajeduzizaru_nonemunimul.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/aMhVP8Q/nozokowibupire.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/dpgjhcC/25434550511.pdfIn PDF document text
    • http://bu-markett.com/604095523867dyev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_601d23fb7815c.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/jehajiw/nhl_news_and_rumors_today.pdfIn PDF document text
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/587976.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/ogfdigr/wewotuw.pdfIn PDF document text
    • http://goloszauniver.fun/fejuwf3wfh.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/jaJWIii/neighbors_of_mod_apk_temple_run_2.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/zuzagezipujax.pdfIn PDF document text
    • http://baltika-trans.ru/plural_of_nouns_exercises_islbtgy5.pdfIn PDF document text
    • http://ru-en.xyz/66800424278vb16u.pdfIn PDF document text
    • http://my-favshopf.online/9545138551zqqt1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5fe39c4c73dbb.pdfIn PDF document text
    • https://lubafotet.weebly.com/uploads/1/3/1/3/131380208/donefuzerowuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5ff2a96ea2e4e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 5592 bytes
SHA-256: d1661209e21adc4ae2a2f3dc01ae69865456f8d09cf6d8cddbd9a4a927025501
font_01_sfnt_off000141e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 11032 bytes
SHA-256: 687a398be5e6d972ac3a97d3a0cfdcc30dfacacc326e6d7271d385b7c261c385

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