Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84ba049803e3d38…

MALICIOUS

PDF

70.5 KB Created: 2021-03-30 07:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcaf11ae308cff0c1ec3fb849d7c5dd8 SHA-1: 58555c61678d4aaac9cbeb27a4eef5ad9fa4dc57 SHA-256: c84ba049803e3d380f11d9069a20e9bbd232a604a33df0a371b779ee2efe5bc8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://xajibur.ru/wix?keyword=south+park+library+hours PDF link annotation
    • http://fullstacket.online/62948345707pwwag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6013c074c9040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_5fe77b37803fd.pdfIn PDF document text
    • http://argo-tourism.com/what_is_general_data_protection_regulation_2018t397p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_603a9e0ddfca7.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/1627344.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/ETKjcgh/fall_guys_xbox.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/9c25c666c6c23.pdfIn PDF document text
    • https://nuwuzeparagagux.weebly.com/uploads/1/3/4/8/134883197/powegiliximava.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/jojirobuxisazoz.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/76057711343fxpan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5fe04ab26b3c5.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/8ifhbii/car_driving_experience_days_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/aotOjic/10221562065.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/hcjhia7/angry_gran_toss_unblocked_77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_60105531ae2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/jajcCgi/flip_phones_for_seniors_sprint.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/turonebel.pdfIn PDF document text
    • http://kapusta.pro/riduludigactke2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_08b0f85ed6a2447eb52dbf83b165cbca.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_d8f2aeded3fb455a98baa186ae6adbc9.pdf?index=trueIn 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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 5316 bytes
SHA-256: 8a227b0b5fceeb8d9af1c4aa59d74e2c803cd96c16a189e19b6fdcb8f0fad3c3
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 11512 bytes
SHA-256: ebc63cf7661bd4b9a0d72c6ee9712d021df3d47011af2605b6c6470011a361df

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