Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5db12af78d8137c…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 15:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a000302f858c9b6e803894cf835dfbba SHA-1: e1a096123fe2e54188c069fcc6eaf145117ec56e SHA-256: e5db12af78d8137c8b42c779db02c4806ed458e2c1cac12a152c81abfd6198b8
126 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=troy+bilt+27+ton+log+splitter+hydraulic+fluid+change PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465144/normal_601b011932a62.pdfIn PDF document text
    • http://hesap-al-sat.com/bell_lets_talk_picture_framel4ctf.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/3070155981.pdfIn PDF document text
    • http://workshop-fb.ru/cerebral_palsy_vaccine_covidqqpvw.pdfIn PDF document text
    • http://qwertyujg.xyz/lijaneji2hcbl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_601dbb4eaf52f.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/will_amox_clav_875_mg_treat_tooth_infection.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/on_the_road_truck_simulator_console_release_date.pdfIn PDF document text
    • http://pesale.pro/android_reader_from_assets_folderxmqnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5fcaa480d984a.pdfIn PDF document text
    • http://pokypka.xyz/vazajimibujefektpcf.pdfIn PDF document text
    • http://vovality.club/wadedukerodoxebudusitotuztmx2k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5fe26baf42fb5.pdfIn PDF document text
    • http://coupons2020.info/how_to_prevent_sore_muscles_after_stretchingzauoo.pdfIn PDF document text
    • http://ketousa.site/hard_reset_my_cloud_ex2_ultrasu7t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_6038b6f676f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494140/normal_5fd79da766f41.pdfIn PDF document text
    • http://zenajok.medianewsonline.com/los_9_circulos_del_infierno_segun_la_divina_comedia.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/what_is_the_emotional_guidance_scale8h7pf.pdfIn PDF document text
    • http://topsalon.xyz/801586443757t2wo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 5820 bytes
SHA-256: b3c132c91f41413a6d2cde0c12c21e2d455eb96520119ff128dbc77fafd33abb
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 11520 bytes
SHA-256: a21913e2fede95a0b2df5bf2d0de16df534f39146c50eb388e8a34c82155c739

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