Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a36f783cb57fdf1…

MALICIOUS

PDF

79.6 KB Created: 2021-05-01 08:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6f4f4c712464e6f50c40ec53234d078b SHA-1: 21e0c1a57c83437b6d49162069289c46d52c9a31 SHA-256: 2a36f783cb57fdf141bab7f9a42c339cac55832af5d1e7443db175ca7eaca399
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 domains, and one specifically uses a UTM term suggesting a product lure ('tefal deep fryer with oil filtration'). The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=tefal+deep+fryer+with+oil+filtration PDF link annotation
    • http://usmileofficial.site/genupcor3h.pdfIn PDF document text
    • http://prodson.space/how_to_read_wind_rosep6ta6.pdfIn PDF document text
    • http://dozixolabizije.iblogger.org/video_show_pro_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/gdoxbgd/bobby_fischer_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/hticDhh/daxozuvuzejebixemusowijoj.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/yoruba_bible_download.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/auto_tune_during_live_performancene4n8.pdfIn PDF document text
    • http://kindraretterath.com/jediverazamakukade3lhxd.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/TkX1Lij/fatexalujepodi.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/9jij5Be/tumblr_girl_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/Awbgjjh/mukijivoruku.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/candida_en_hombres.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/how_to_service_kinetico_water_softener.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikenigekewojo.epizy.com/zutadokapuvekuzatutek.pdfIn PDF document text
    • http://limazajot.rf.gd/11337484835.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/pipefajoxozibivakalumo.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_712995db5f1c48c2ad7f1f4f6e4a51a6.pdf?index=trueIn PDF document text
    • http://gebezivorubax.rf.gd/6000421822.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/atypical_pneumonia_2020.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_d4cd99fa1f224ee5b6c5f655be4f069f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/58539924651.pdfIn PDF document text
    • http://topadut.epizy.com/norabukade.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/borug.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 5092 bytes
SHA-256: 2fc4933ec9f6ced34099293c831b2da61902037eaa71583921a9911c964bac8f
font_01_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 10592 bytes
SHA-256: 4b9ef392f678f7a7aedee897529b401bbea1a5d411253cba7b3e41b1e809b1a5

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