Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcba1f1c303c46b8…

MALICIOUS

PDF

89.3 KB Created: 2021-03-07 13:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cad901f84c203c316b8d58ed1c3456aa SHA-1: b67b4c0f1d206d964f05288fc51b632bca0d263a SHA-256: bcba1f1c303c46b8d9327ba9d4dc29aecd96af93012769cb8e5b036380e8cd09
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/wix?keyword=my+hero+academia+season+1+episode+5+script PDF link annotation
    • https://cdn.sqhk.co/gabunufu/tW6hcij/photo_lab_photo_editor_pro_apk.pdfIn PDF document text
    • https://deneresibixu.weebly.com/uploads/1/3/4/6/134662350/boxesabadolo.pdfIn PDF document text
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/sonirugixog_lesarekatek_gabunukukewosuw.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/jikunu_xabibo_matujomaruk.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/lajimesopiv-kadugokamewebik-zanatuvita-powuwadutuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fde0b7a7134c.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/hiO0fjh/panzer_platoon_mod_apk_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369797/normal_60004b6f7a388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5fe6f8158a5d8.pdfIn PDF document text
    • http://zinedoxo.22web.org/maths_graph_paper_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_60307a713e81e.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/eIjfjef/craftsman_automation_news.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/f707560c.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/ijJpjdz/jigenadepewe.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/gulumum.pdfIn PDF document text
    • http://vaxuserinux.22web.org/do_bose_soundsport_wireless_headphones_work_with_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebe1588-49d4-4da0-bd30-906be85ede08/rekesisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325b8577-dd10-4c4e-b55c-b4898e2ed331/who_are_the_giants_in_norse_mythology.pdfIn PDF document text
    • http://buxidolobiw.epizy.com/kerala_legislative_assembly_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53f1ace-5cf8-430e-8e6f-b1bb2bb632db/garmin_nuvi_2595_user_manual.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_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 4988 bytes
SHA-256: 2fc88d5117d447f5729050bdaa56afcf6fe44b891070468419c64f31061ca3e4
font_01_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 5564 bytes
SHA-256: abfbfe3d2e3c719672809a06822322b71c70eeff214aeb6183ff08128d9a1c0d
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 10852 bytes
SHA-256: a71a704e02698f4a9a870612a4dc1e176f75ea69634f97ab6099362efd355475