Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e21b5ad6203afe…

MALICIOUS

PDF

75.0 KB Created: 2021-03-02 06:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 815258a7a929bc63736307b33a7097d2 SHA-1: 35e16d3235cf364c05dc046aa2dbdd5e40af9194 SHA-256: 88e21b5ad6203afe4f6754819bc6c504d5dc86b39d224ef41349e0c6c68ad277
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=kali+linux+programs+on+ubuntu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486045/normal_6001c63f8e992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_601323d1c088e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5ff3623b10a5e.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/a0JBJEj/89427288454.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/c6afdbc10cf.pdfIn PDF document text
    • http://zezarujewida.iblogger.org/little_house_on_the_prairie_season_5_episode_23.pdfIn PDF document text
    • http://obmenkalnr.online/51063474757iooem.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/govusilo-ginomupekisijeg-wamelumexenep-guzemexefu.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/Nhez9YO/working_days_calendar_2019_ireland.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/tatadilez_zikubodogenefa_maxamup_bubusipope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe2e451234e7.pdfIn PDF document text
    • http://weloxeripen.iblogger.org/anjana_anjani_movie_songs_ming.pdfIn PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/1498356.pdfIn PDF document text
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/e2e1ebed33a.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/xijalovelokolep/tafopeboriram.pdfIn PDF document text
    • http://mujunuge.rf.gd/vox_ac15hw1x_for_sale.pdfIn PDF document text
    • http://bokatamekal.rf.gd/playstation_gold_headset_pc_setup.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_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 5316 bytes
SHA-256: fe0ff66c345df6219d1dfb2351713c5028f4c72386c34a260fd84d22e095c0a1
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 11116 bytes
SHA-256: 193fb49b1e74d968fd9a3145eb3847cbae08c1934ecc219a1009b9a069081527

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