Malicious PDF — malware analysis report

Static analysis result for SHA-256 4920e8e8e7baf942…

MALICIOUS

PDF

77.8 KB Created: 2021-04-09 01:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0e1488359426974a9197d7af2beacb4f SHA-1: 511cb2c79eca4bb00f9f0c951f7361e37006e406 SHA-256: 4920e8e8e7baf942cee45d1759d4c5f1f5f89b7261c645fd65149170cd80ac0c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

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
  • 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://lozipotod.ru/strik?utm_term=manual+de+supervivencia+colin+towell+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/raridulil/h2vjj2b/17457335705.pdfIn PDF document text
    • http://gisujug.mypressonline.com/73729712039.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/8igjfEC/wwe_battlegrounds_roster_legends.pdfIn PDF document text
    • https://cdn.sqhk.co/venujotiwufo/WqSshi0/checklist_clipart_outline.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/hihc4jh/69809821972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fed1ed314a60.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/xgeggSl/epic_raft_fighting_zombie_shark_survival_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_5fd8605a89780.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/bihihak/cobb_10_theater_winter_haven.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/20378934216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ff9199ecb194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_6060c6010e1d2.pdfIn PDF document text
    • http://goodsun.space/first_grade_math_problemsmaf6k.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/farejiwega.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/onkyo_tx_sr608_no_soundzax5t.pdfIn PDF document text
    • https://cdn.sqhk.co/radageroboko/jbSbvbL/netisigogu.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/Ejb3Ujc/bright_memory_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejutox.rf.gd/97865271429.pdfIn PDF document text
    • http://jovupoxorunalox.epizy.com/zupifadupowuwubo.pdfIn PDF document text
    • http://josesomesube.myartsonline.com/38158227442.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_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 5480 bytes
SHA-256: 9d0b8717a71be6ea0c4387b8db2bffb929088ad2fdde2b4f271054358a048787
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 12848 bytes
SHA-256: e4bb5efa0dbf77e1504f35b2056a23f9cc93cbcec60823abae3044619638c45c

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