Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f143f88690474e…

MALICIOUS

PDF

79.2 KB Created: 2021-02-28 00:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 185fc26288ecc4b8f6f395c058d50c85 SHA-1: a5e88c4c35abf51a1f65ccecb27dfa0635f3cd93 SHA-256: 64f143f88690474eb4abc7a12365c4d2135ccf5ca4cde2c5175d23f5842e52de
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/wix?keyword=wrought+iron+table+legs+bar+height In PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fee9514d3a00.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/cgd4Qhc/machine_gun_kelly_daughter_adopted.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fe075024d329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fc75023568df.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/araby_short_story_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_6011ee99dc6c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5ff7131aa636b.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/1jcvOi2/school_management_system_with_php_open_source_project.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5ff97bdb227d1.pdfIn PDF document text
    • http://hiziryigit.online/saris_cycleops_fluid_bike_trainer_reviewkrcee.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/rge3gcy/newevafitoxenaletodonawi.pdfIn PDF document text
    • http://lg-supportteam.com/81848335813f5oie.pdfIn PDF document text
    • http://itash.space/oldies_music_station_seattlekmqcf.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/zetivujukod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_602706266b9aa.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/70012470667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nukilaba.myartsonline.com/53335883091.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 4984 bytes
SHA-256: 16e5ec7fc3b289779611772d5ce730efe6daae7f9e125c17e06395b5864d5ad5
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10888 bytes
SHA-256: 640721dcba7bd95e7a539a1d0cd95b7fc2833e99ed9330049c6cb786715187b1
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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