Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d039f43b7aacb…

MALICIOUS

PDF

146.1 KB Created: 2021-03-26 13:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8d0ea9f2b97fe51067fb7f2d4dcacb0f SHA-1: eb05a818150b20ed70d76513613f25e1a7514fbe SHA-256: b45d039f43b7aacb53b7dff4ba1fed5472abbe10ab10f9a91e7c242eee80e5cf
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/award?keyword=accords+de+bretton+woods+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5ffbd898a0f1a.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/sulaxopu.pdfIn PDF document text
    • https://jumedewumeba.weebly.com/uploads/1/3/4/3/134310957/xadawewawemunum_nuwalujuz.pdfIn PDF document text
    • https://suwuriruwidasuw.weebly.com/uploads/1/3/4/5/134511566/vujibefejivuwop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_6004be721e811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_6042073e3d102.pdfIn PDF document text
    • https://sopetenoredu.weebly.com/uploads/1/3/5/3/135318191/mimos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605d6d6b0df74.pdfIn PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/dejepajidokove_zuwewolu_fenenuxolapever.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/patener.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcfae1248176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_604181a4c2e8e.pdfIn PDF document text
    • https://sirawosoze.weebly.com/uploads/1/3/0/7/130776152/d0d51f1b94.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/446a7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_60314d7b990b1.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/36835b5d33c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_6045c207aa1ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469831/normal_5fffbff45fab1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_9b6d5b2680bc4b5aac4ae5aa0392e603.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_6aaa057d0c0c49fbaed1cb6bae95ce22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1377a8-5ca2-4cdd-8084-160dcb717536/gas_law_formulas_cheat_sheet.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_a55750f00815437db7d66a893d65902f.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_4ad76a8295df477489e4834fd40e8885.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ef409c-c636-4e8e-808d-693e5e0665a5/introductory_algebra_for_college_students_7th_edition_robert_blitzer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a89dfa5-e097-4f79-9e02-e202626220ce/1476175141.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_off0001ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF2B 5128 bytes
SHA-256: d64a71d8a1ec67d65510f768759e58fa18af618d7e06902b99aac50826c57448
font_01_sfnt_off000210be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210BE 12276 bytes
SHA-256: 9c8ea4a7e0b3d401f0d06f9069fbdddd6141b7d85a238e317e22375968dc5e4e

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