Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fda6ee3f35038b…

MALICIOUS

PDF

79.1 KB Created: 2021-02-22 01:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cdbdc9dc82e2d0d1b4f983b5c9c3f581 SHA-1: b8d34c8ff1ff7c0804cff3569e724022de9c2954 SHA-256: a1fda6ee3f35038b1baef45273a6e0541f6a7fd941b3d2c3e840be6bcb0aa5db
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain text related to educational topics, suggesting a lure to disguise the malicious links.

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/strik?utm_term=speaking+activities+for+senior+high+school In PDF document text
    • http://youla-24.cc/zuzekijirazojuss9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fdfa1fc86e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_60149e2561d0f.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/8iiPidm/download_football_2015_java_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170aa454426.pdfIn PDF document text
    • http://kasyanbeauty.com/727985609750zsbx.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/Iiagiid/wovakizum.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/jjbhigZ/best_base_building_games_pc_2019.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/f62fae22.pdfIn PDF document text
    • http://ergors.space/jozorazogeszy.pdfIn PDF document text
    • http://botojagi.iblogger.org/57346605514.pdfIn PDF document text
    • http://kuzojud.66ghz.com/minisakus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffb14906a3fe.pdfIn PDF document text
    • http://marketop.club/living_air_xl15_reviewnapai.pdfIn PDF document text
    • http://detonic-hypertonie.website/mifasezedadodatisilcavd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofosuxubajo.epizy.com/english_grammar_exams_with_answers.pdfIn PDF document text
    • http://diturasenupope.epizy.com/jemovedupir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 5504 bytes
SHA-256: c1c06033d1e9c4908e3ca42728c3131cd000cf19801e4c0862e399a40d6274ef
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10156 bytes
SHA-256: a69d421c3eea71df542529de760ed4388bc16b05cd92de3536b2c555f3962ead

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