Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d0e7835f988092…

MALICIOUS

PDF

77.4 KB Created: 2021-04-14 22:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: eda5aaec025c3f49a761863b58726146 SHA-1: 77efc0d53b0d4b51ae3dba22a2652a6e25e25865 SHA-256: 15d0e7835f98809217edb75de124e25f7fa2c7d8e5e5c399b430f755e16f14cb
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, indicating a link farm designed to direct users to potentially malicious websites. The presence of a URL with a 'strik' path and a suspicious query parameter, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure and URLs point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=they+play+video+games+in+spanish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605f82bfb7605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_602d85b4f2361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5ff378719d1f6.pdfIn PDF document text
    • http://pop-marketplace.ru/4890190307zukg3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_60145a6c780a7.pdfIn PDF document text
    • http://robertferrell.net/rolagiletegitegawotuwa8ys37.pdfIn PDF document text
    • http://arm-watch3.club/money_maker_plant8w5sc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_604d08cc41678.pdfIn PDF document text
    • http://idealica-ufficiale.site/5191354861yxezr.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/math_u_see_answer_key_algebra_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_60204be9193ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nobuxuka.epizy.com/what_word_families_should_i_teach_first.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_8a286f564cb0431dba61a7d48fb2e187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/983f9e9b-45a3-40dc-8145-ebf835e02f65/samidulodobul.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_bf00fe3e9e4d4276a1c0970198e6e49e.pdf?index=trueIn PDF document text
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_482242183c734ebcb7811438708fb748.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_5fe11c08f7cd412d8214423f144c7936.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef443637-7866-4e3e-9a36-478b719fb8f4/lopi_endeavor_stove_reviews.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_off0000ee58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE58 5388 bytes
SHA-256: 29e2ca7fb5f5d04a10b96722de26e0ad9382805297a07b061014b03c09deca7a
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 11132 bytes
SHA-256: 35b68d406f86e7e842c62930d802c7ad9950db77363d3cd696b3e32cd09b8f77

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