Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda973f78c41bdca…

MALICIOUS

PDF

74.5 KB Created: 2021-01-06 02:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 44396cb433266aac11d176813e9420bf SHA-1: d587a32460df1923de48629bca0cf961c429b744 SHA-256: fda973f78c41bdcaf307b3913748d8a9903ef75f17c9c6033496c99ba3ada7c3
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable hosting services, designed to redirect users to malicious websites. The heuristic firings indicate it's a link farm and a redirector, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm structure strongly suggest a phishing or scam attempt to redirect users to malicious content.

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://cctraff.ru/123?utm_term=coffee+bar+station+furniture In PDF document text
    • https://jujivonigipegi.weebly.com/uploads/1/3/1/4/131453429/kubilitigulikitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fd638e4e6d6b.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/sawewi.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ijugdja/27193902612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_5fa6508164382.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/7581327.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/ghYibYM/20283734981.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/1560464.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/whcdhcM/vr_cartoon_360_watch_free_movies.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/d8792b.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/luzufi-wuvimejiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/ijgghjS/best_among_us_mod_menu_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fccec7028542.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_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 4776 bytes
SHA-256: f0711f2ac210179726f264e9d8bd32420ceaabad58e3cb8452c7af30d532d1ce
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10664 bytes
SHA-256: 1674d27e2ccc4ffa34d78003e274667707c9aab31a7e1f61b07080406e9e9bed

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