Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31ea4e6828dd222…

MALICIOUS

PDF

76.7 KB Created: 2021-01-12 03:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2f85cb4876bdd31748a996f63efd14b0 SHA-1: 7c63c39815bce16925354504afc9302318647fff SHA-256: f31ea4e6828dd222b6110831c5655276254226d3eaec312cee776e00ce1a1927
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also flagged the PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or host malicious content, potentially leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ggtraff.ru/123?utm_term=path+to+success+graph In PDF document text
    • https://cdn.sqhk.co/jazepoxamib/Nhhijjb/defense_legend_3_future_war_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fd1fff5c1124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5fce0435f3400.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/2eea40b36.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/q0B2qhi/alone_season_7_winner_roland_welker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488837/normal_5feb16515697e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f92a9cfaa0a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5faeb22bafefe.pdfIn PDF document text
    • https://cdn.sqhk.co/tixelila/TqVuA3p/roblox_pumpkin_carving_simulator_codes_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/dbms_utility._format_error_backtrace_in_oracle_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/4983152760.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/java_swing_tutorial_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/icde_2020_deadline.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 5164 bytes
SHA-256: 23367988dad91cd8e31c0024c88b287dbbe98700a02d7e890cc43d069274f5b0
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 10248 bytes
SHA-256: 7d1f61538abbd4cfaec97528de06de9fbe41012a314dbc39c343a0cad7150d5e

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