Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bf28101ad6483b…

MALICIOUS

PDF

75.0 KB Created: 2021-03-28 01:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1aa3280c7838136207d2eccdb19cbdcf SHA-1: df6a99aebc045fec155a8a9a42bc5c9336948946 SHA-256: 51bf28101ad6483bec44aa1901e6bc8c218eab38d3960a0cf5f9532617826107
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further malicious content or credential harvesting.

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://zajinet.ru/wix?keyword=i+saw+her+standing+there+game+3+unblocked PDF link annotation
    • http://puvepum.getenjoyment.net/el_hijo_horacio_quiroga_analysis.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/lufutefizorodoledo.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/sunidurubizozurexomekoxal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_5fd1b6347c935.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/ggQxWil/jingle_bell_song_wapking.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/86273355412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_604400425109a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60432e7488101.pdfIn PDF document text
    • https://cdn.sqhk.co/mivufarowiwi/RgdAdjj/7298959097.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/ideologies_and_social_work_murli_desai.pdfIn PDF document text
    • https://cdn.sqhk.co/vapitinab/ghgjAyM/63528712228.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/CVijMie/lesson_plans_activities_for_2nd_grade_measurement.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/hf7hg8Y/sword_makers_near_me.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/l_alchimista_libro_gratis.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/94680589787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ffaa1d7d0481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d01497e-2336-4f5a-94e6-f03d78ae37df/how_to_write_a_reflection_paper_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c041992-a095-4754-8470-c2836f031aec/20329149528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be34140-5022-4cd8-ab65-91c559c5d0e1/adobe_acrobat_x_pro_serial_number_crack_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae5ba0a-6cc4-4c63-82b8-5c918d3e2efc/51643728831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d553a4-ab3a-4e1e-ab34-09bc3435cf51/67763398385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4785739-b2c6-4951-a1cc-494be7dca73b/sensus_water_meter_parts.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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 5748 bytes
SHA-256: 48f0bcc0fa160acc5eec09cb88ffb807ae0a636ff5c0ddd05058fee392eb01ba
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11060 bytes
SHA-256: be2093dbe18d141488c28b2e8e1f2d83dc9fcbd72633c545d607e57a834b37b5