Malicious PDF — malware analysis report

Static analysis result for SHA-256 350061c1c39b2876…

MALICIOUS

PDF

71.1 KB Created: 2021-06-09 17:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 74cd52ee445d8f0554d61ed86e4f7117 SHA-1: d9075f6d8cb14d599cca65dbd998dadd6941def2 SHA-256: 350061c1c39b28760a05adb57a4fa0609bd8a4dc527bcea7b0610acc2cbedc4c
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 pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/pbw?utm_term=download+the+phoenix+project+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498348/normal_6007e9a6049a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fe6c7e46c9d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_5fefdce260ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fd6248f509c3.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/luraw_diwuxozokixo_mudezabuledi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_6065e59d3c67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_60142e666d3e3.pdfIn PDF document text
    • https://fozaxebefi.weebly.com/uploads/1/3/4/5/134584315/tajofo.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/2109908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_60665a1590995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_606006ecb8334.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/2c05ef174d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fd10cfe98f41.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/6e59a684dc527b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144648036/wevigiwikugedidawaka.pdfIn PDF document text
    • http://fokojifidesi.pbworks.com/f/can_i_get_thailand_visa_online.pdfIn PDF document text
    • http://labidan.pbworks.com/f/jiditunuvo.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/w/file/fetch/144895797/vuviresogawokitibume.pdfIn PDF document text
    • http://bikopatepo.pbworks.com/w/file/fetch/144820791/ds_261_sample.pdfIn PDF document text
    • http://xifatarege.pbworks.com/f/syllabus_of_b.ed_entrance_exam_in_up.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144668109/37837665731.pdfIn PDF document text
    • http://lipemuv.pbworks.com/f/89065167177.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/fire_emblem_warriors_weapon_skills_guide.pdfIn PDF document text
    • http://betifufato.pbworks.com/w/file/fetch/144654504/zekukaxi.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/24978586075.pdfIn PDF document text
    • http://xugatun.pbworks.com/w/file/fetch/144661893/how_to_removeelement_watermark.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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 5300 bytes
SHA-256: 113be92c7d99e06c76ef7ba198502da677fe2f8510cf2be4228c88dd618d7a7e
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10448 bytes
SHA-256: 9e668af64c6c08573572d78f2cd4b74c4dadbdf38fa044f15ecb5927ef5837c3