Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0592b206f7a1840…

MALICIOUS

PDF

76.1 KB Created: 2021-02-24 22:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55285d5eaacd27a31a9f0b6bbe26c8c9 SHA-1: 4f9c6efbc8f690e6c0773899e41e31505136549e SHA-256: c0592b206f7a1840d5249f16e04a7c2937ce798b726d25c1cc951bbfd6b66a31
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to lead users to phishing or malware distribution sites.

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/strik?utm_term=yoga+mudra+asana+benefits In PDF document text
    • https://luzusuzure.weebly.com/uploads/1/3/0/7/130775685/finijugek_selorimoxafuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Rhex7ij/star_wars_heroes_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/ijlVYA0/77584034672.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/igKgcjb/hourly_weather_gold_mountain_golf_course.pdfIn PDF document text
    • https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/ff5ede.pdfIn PDF document text
    • https://woruranevulabiw.weebly.com/uploads/1/3/4/0/134096732/6218576.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/7Utgdge/17663236747.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/hbjduha/48645772795.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/dfcf0.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/netugagilomag.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/9MvNG4s/cookie_clicker_stock_market_bot.pdfIn PDF document text
    • https://mebevoluw.weebly.com/uploads/1/3/0/7/130739105/ditazozarawifeb-zeropazemamoki-figubalimogo-tegupunabus.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hnii5q5/dan_the_man_android_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/eXShhji/jedukovefunutus.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/buvedenex.pdfIn PDF document text
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/9644414.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/hdjdheN/photolayers_superimpose_background_eraser.pdfIn PDF document text
    • https://mebemawadaj.weebly.com/uploads/1/3/5/2/135295691/4866647.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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 5296 bytes
SHA-256: 38417e175833fc56457f6dba1093860c31cc173d4583a6b31b2d5e8f3d868aca
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 10908 bytes
SHA-256: 530862547755e4a1982b828adebae0d1b80c06a2e6f3e4c91145d853e1ef6004

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