Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae71596f8d771acc…

MALICIOUS

PDF

72.3 KB Created: 2021-04-15 22:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ccc27e51c9b5e8cc219792ffa4e99f0c SHA-1: f5406e2ebb8d3682efc56dd59d65c6387f8881b4 SHA-256: ae71596f8d771accf4d4cd50d7ee762382b8a98b94c3f226e52341d72be0a1d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=prevost+h3-45+for+sale In PDF document text
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5fe4981b0411b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6028a6955ed1e.pdfIn PDF document text
    • http://jibiduseg.22web.org/video_player_android_terbaik_ringan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5ffefb18c4d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_6018482b2f153.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/projeto_alimentao_saudavel_na_escola.pdfIn PDF document text
    • http://tijatatese.22web.org/writing_an_academic_journal_article.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381740/normal_5ffb97c818f93.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/hgijihi/jodib.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/Mojjgjd/spirit_riders_trailer.pdfIn PDF document text
    • http://gutudixob.iblogger.org/juguvebewusovoz.pdfIn PDF document text
    • http://vezesan.iblogger.org/64174628509.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/pTDTjd3/49201607711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fefirujo.rf.gd/vizepepofafulugum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880b86be-8a8a-4970-b4dc-5e36864e12fc/sujigoxin.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/accelerometer_sensor_games_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590dc6b3-b06e-4720-bb4b-b7134d9cfad3/exam_cram_comptia_a_220-901_and_220-902.pdfIn PDF document text
    • http://sipuluku.rf.gd/73097012504.pdfIn PDF document text
    • http://kalawutef.rf.gd/20281779971.pdfIn PDF document text
    • http://vobapaz.epizy.com/aldous_huxley_doors_of_perception.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 4956 bytes
SHA-256: 445dceaea1f7ab7b8d844efb510af657c78924a9a87d88320cf9f5bb114e61e1
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 11200 bytes
SHA-256: 0207c8cf789060924801898bab293e3172828a20c4343987f8171925430b3596
font_02_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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