Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8206007b0282bf…

MALICIOUS

PDF

69.9 KB Created: 2021-03-31 00:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9417e6a60aa84071ee771925f5c3d187 SHA-1: 1818a6d6d585361a32d95bf2bc87a363736e8978 SHA-256: 4f8206007b0282bf4c87963eb691237b2d3e22c9daa369246d728c65144f38d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a specific heuristic identifies it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=2007+mazda+cx+7+firing+order
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/58754fa8b8c0b.pdf
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/woxofew.pdf
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/1e6ac2832416.pdf
    • http://tozofuji.scienceontheweb.net/bacon_s_essays_summary.pdf
    • http://bavewemelemare.iblogger.org/pdf_to_word_converter_download_mac_free.pdf
    • https://laboxowoxom.weebly.com/uploads/1/3/5/4/135400847/3803613.pdf
    • https://megefutuw.weebly.com/uploads/1/3/0/9/130969536/ximajun-bisitizaxadus.pdf
    • http://bibivire.mygamesonline.org/is_1024_x_768_resolution_good_for_gaming.pdf
    • http://faketikus.22web.org/66417764100.pdf
    • http://gojoges.iblogger.org/63635362470.pdf
    • http://degimogug.mypressonline.com/raduguj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muwemivumazulax/zedote.pdf
    • http://kumoxamumusuxa.rf.gd/jatugotimumilonufodin.pdf
    • https://s3.amazonaws.com/lolijexejomak/zilun.pdf
    • http://galiwasik.rf.gd/gavarigo.pdf
    • http://xewajube.epizy.com/jofuxuv.pdf
    • http://jisunopesaluzi.atwebpages.com/51865376893.pdf
    • http://zovitox.epizy.com/8454400532.pdf
    • https://s3.amazonaws.com/didowugorokirug/38756815742.pdf
    • https://s3.amazonaws.com/guxosa/esker_hills_course_guide.pdf
    • https://s3.amazonaws.com/viromibukoleliw/is_allegiant_movie_different_from_book.pdf
    • https://s3.amazonaws.com/sefepugolupalax/what_does_the_bible_say_about_adoption.pdf
    • http://reladefuxuna.onlinewebshop.net/questoes_de_analise_combinatoria_e_probabilidade.pdf
    • http://junedujivoxoz.epizy.com/how_to_video_from_linkedin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d0.bin
cdb65a5776d7aabe7b5d4fd95cf03b4499adfe93d614d76a09685a8e0f1a8f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 5508 bytes
font_01_sfnt_off0000e78c.bin
49befa15dd00a6062c80eb9349826c4e97e529abbb3c465e8d771d71e96bb6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 10216 bytes

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