Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace9c98ebdda5c48…

MALICIOUS

PDF

61.5 KB Created: 2021-02-17 07:12:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a0cbe254bf96314496ce013c3c933150 SHA-1: 2c4d536dc28617701374af312bd50f73ee6fb9eb SHA-256: ace9c98ebdda5c4895cb9dce00a0da830fef33fffaa8eeec8372758c5b219f7d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to search terms, suggesting a phishing or spamming lure to drive traffic to malicious sites.

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
  • 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/123?utm_term=what+is+the+best+battery+operated+heater In PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/mifuwumeme_xuwad.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/6ggifJT/79210153090.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/hjgsuS8/wowitejudasejuroloda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6023d728eefa5.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/7272252.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/d45934b65b6a08.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/4973869.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/gjjgigg/vidutazixotu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temekem.epizy.com/78349673519.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/30218266943.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/impact_of_cash_dividend_on_balance_sheet.pdfIn PDF document text
    • http://lesesopexapawu.rf.gd/zususona.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/reliance_arbitrage_fund_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/apollo_13_fun_facts_and_information.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/tv_serial_song_mp4.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_off0000b617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 5272 bytes
SHA-256: bd6b3bcf65b017de3630790c20f08c6491b136719be7238c215728e7113f708a
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 9696 bytes
SHA-256: 13f4cbf0b6b2dab2d045139eecb1cfd8956e2e399c1ba908db2bf09a5d1e47ab

Open this report in the interactive analyzer, or submit your own file for analysis.