Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39c75a88a2b94fc…

MALICIOUS

PDF

80.4 KB Created: 2021-02-22 02:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b2e9af5faa381ed3c5aca36e780b97e SHA-1: 2ff2db8c71fbce674572c8f4c148c5234f468f53 SHA-256: d39c75a88a2b94fca7a4b771b355ce8c4a6306ceedcd049110f9cc3c654e9eac
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL being `https://jottigo.ru/strik?utm_term=skyjack+sjiii+3219+parts+manual`, suggesting a lure to a malicious site. The document body, though heavily obfuscated, indicates it is presented as a 'parts manual', aligning with a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=skyjack+sjiii+3219+parts+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5fd05ff16da22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_6031fb73ba740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470207/normal_6008f604a8b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_600f902de7815.pdfIn PDF document text
    • http://kemijejanurag.iblogger.org/81536093230.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/kuxekumubopesitafu.pdfIn PDF document text
    • http://temipedozut.22web.org/tazubifinamepuzibum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_602984d1c75e3.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/ganegewe-vumenazavupum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fe221aeb9f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5fe50d49c145f.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/7924941.pdfIn PDF document text
    • http://xowozumevabig.66ghz.com/backgrounds_for_pivot_stickfigure_animator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd64973f215a.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://borinalujid.epizy.com/winijopaxizaxalaruk.pdfIn PDF document text
    • http://lopumupukerodu.epizy.com/40777387279.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/12599101165.pdfIn PDF document text
    • http://pevinojemodil.rf.gd/bairaag_1976_movie_songs.pdfIn PDF document text
    • http://pidezesu.rf.gd/24721286351.pdfIn PDF document text
    • http://pariwexeral.epizy.com/43562117135.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_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 5580 bytes
SHA-256: 6facb7aa0bead1944c696a3a82d8de82943d537a9d4cce2f584b1d1d3cfe9c7a
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 11196 bytes
SHA-256: 4df49b4663e77bace36aa7a55ff7996a2da7f369ae8dded545b690c3dd6f6520
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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