Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2be17ad6ce445a…

MALICIOUS

PDF

86.6 KB Created: 2021-03-03 18:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f7600b0710376c9eb043930ce04ee701 SHA-1: a2c8407cf2203ab8daefea55316b5b171c92a2ef SHA-256: ad2be17ad6ce445ac53e25973c9905e1300683e8537218dc0421e9ce63c0e03b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/strik?utm_term=cub+scouts+emblem+of+faith PDF link annotation
    • http://xavelodezazil.iblogger.org/amumu_jgl_guide_s9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_601d51fedd31f.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/dakokad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602f0a0633dad.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/hjirl0E/kulovavomepunoxevaribabop.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/kitchenaid_gas_range_with_double_oven.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fcd377107e70.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/treatment_guidelines_for_acute_ischemic_stroke.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisibu/YAjdjgf/78470483173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_603c36b6259a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5fd6538f49970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_60177570b483a.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/clasificacion_de_cuentas_de_activo_fijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_602ae03d0bfbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485698/normal_5ff19c0c79979.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/genie_2022_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://dezinolabebosod.atwebpages.com/unreal_engine_4_fps_tutorial_c.pdfIn PDF document text
    • http://zuputes.atwebpages.com/tifabatututawanodavozij.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 5068 bytes
SHA-256: c3a94dc688e0b7ad844bb1fb72a609ea1a9efb3377067cd7ecf5ddc38add8981
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 10468 bytes
SHA-256: a9b7d2c309223758e7ee94eb9af9a046559f5d5c9f943152333da815f1a2f811
font_03_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 14376 bytes
SHA-256: f2152700f67563f96df77d2390cf98741f895f4be02b984982c8b7754ba5f15a

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