Malicious PDF — malware analysis report

Static analysis result for SHA-256 c920ae4544faaf72…

MALICIOUS

PDF

78.3 KB Created: 2021-03-17 14:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 79ae78e2d507e000d0f6dca453bb9dea SHA-1: fc3d7f93582274ac050604684119411bf5c0927f SHA-256: c920ae4544faaf72550a49eba693d08b921cfb4a968021a40482611c35a680c7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing a drug test, suggesting a phishing or scam lure. The PDF is also flagged as a link farm on disposable hosting, increasing suspicion. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=can+you+use+colored+water+for+a+drug+test PDF link annotation
    • http://nubebukexowi.66ghz.com/35263424014.pdfIn PDF document text
    • http://instapriz.site/ball_python_snake_typesavc1m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_604edd78b4535.pdfIn PDF document text
    • http://flash-sar.online/the_miracle_morning_summary_youtubeuaoj7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_5fe26f8c28fdd.pdfIn PDF document text
    • http://wssummer.space/word_chef_financier_answersck1pl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_60387d7cc671c.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/phhm0GO/36872422918.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/SVibPhg/5124112973.pdfIn PDF document text
    • http://naturfresh.fun/vewipuxzywxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_603b6239a9d0e.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/ZCtJcjf/54958922683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd2a14948ce0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5ff95ed699b54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifuwonojize.epizy.com/follicular_thyroid_carcinoma.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/monthly_income_spreadsheet_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8952b596-5d7c-4398-8b81-096d5ae926c4/hp_elitebook_8540p_i7_datenblatt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2c04d9-6e4a-4ede-84cd-78b0bad47014/alkaline_diet_meal_plan_for_weight_gain.pdfIn PDF document text
    • http://dixasimoxipux.rf.gd/tudafijorow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2586694b-4748-4fd9-9f91-d858f6bf74c0/74196470497.pdfIn PDF document text
    • http://negakibuteno.epizy.com/logic_10.4.8_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54a4feb-efdd-43f5-93e6-e199dd17061e/hannah_arendt_what_is_freedom.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_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 5288 bytes
SHA-256: e76f6085cb155e7145012a181fa6297e2815a3c2572315e71407c9949f16885b
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10972 bytes
SHA-256: bb664e351358390d0fc665ebe6e707f6c52df77e7474a3963a4689b98479cd13

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