Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f012155e7ccd52…

MALICIOUS

PDF

69.7 KB Created: 2021-02-20 01:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 73b69fbbcbdfdf861ac3a0caee1d39cb SHA-1: e7e8b4449f1e475fd430ca6813fbde96f1e526e0 SHA-256: f5f012155e7ccd52d86dc3c059931b501b57ba39d384a935f1c57909c3d9fa74
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'look whiter teeth' and application metadata, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://yafferge.ru/wb?keyword=look%20whiter%20teeth In PDF document text
    • http://fortysgjdk.fun/military_college_murree_admission_fo78i95.pdfIn PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/8483556.pdfIn PDF document text
    • http://mavpa.fun/gomarudufimivegirubisifyoj9.pdfIn PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/081e00bf01be090.pdfIn PDF document text
    • http://mazers.fun/flappy_ducks_deeeep._io2dxbp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_6006a5697f93c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459935/normal_60012b4d8db4d.pdfIn PDF document text
    • http://yildirimotobursa.com/had_better_should_ought_to_exercisepvui7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fe3c92304c07.pdfIn PDF document text
    • https://wogizirimabote.weebly.com/uploads/1/3/5/3/135337148/7906023.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komiguzuvare.rf.gd/executive_summary_format_for_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/bleacher_report_live_roku_app.pdfIn PDF document text
    • http://vonolukover.epizy.com/89503882336.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/ab_fir_jab_baarish_hogi_song.pdfIn PDF document text
    • http://fakexebubigej.rf.gd/50704057144.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/green_energy_uk_annual_report.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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 4452 bytes
SHA-256: e8cdff6561e33c37e1ab806597b6a06a664c25b90aa767a7fec61e0721d72f17
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10164 bytes
SHA-256: 56c65dba3beb5f081baad402f8152d2b9568a882da417a305afe07f246dabc6e

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