Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88b7e877efd1cb4…

MALICIOUS

PDF

86.8 KB Created: 2021-04-02 13:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a6e72ee203feea64c20b6eb87cea42f SHA-1: e2c15616f024e7a2c7d278b16f23ec08a685f856 SHA-256: a88b7e877efd1cb465ad3fb6b530006a95904d1b71c3de57654cfa5c52c82e7b
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=manuscript+format+of+report+writing
    • https://cdn-cms.f-static.net/uploads/4409609/normal_6020d17318f81.pdf
    • https://static.s123-cdn-static.com/uploads/4453890/normal_5fcfb064e9871.pdf
    • https://cdn.sqhk.co/sipebililofo/gijijhi/84327580816.pdf
    • https://cdn.sqhk.co/tosilura/igiihCf/crash_nitro_fueled_tawna_pink.pdf
    • https://cdn.sqhk.co/jasuxerazifo/jPjePjg/40777498519.pdf
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffde1af57619.pdf
    • https://cdn.sqhk.co/moxawitab/Cid9DU9/63092096878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_afaa7d0929ec4db7b0393806dc84dd2d.pdf?index=true
    • https://s3.amazonaws.com/zafijukopa/queen_mab_chariot_drawing.pdf
    • https://s3.amazonaws.com/safago/langmuir_systems_user_guide.pdf
    • https://s3.amazonaws.com/tugabijenovili/c_programs_notes_in_hindi.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_c012661c366c4b8ab7f0fa6edd8be9a2.pdf?index=true
    • https://s3.amazonaws.com/lizuseguwix/2465301307.pdf
    • https://s3.amazonaws.com/tuzamada/automapper_map_list_formember.pdf
    • https://s3.amazonaws.com/dazinibonofobi/soxefakitetopegu.pdf
    • https://s3.amazonaws.com/pibabopuduj/instagram_like_png.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_2ad8b3aa68fc4c568e770135eb5e242b.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_c28b9ba5547844109660f1e679e24bd0.pdf?index=true
    • https://s3.amazonaws.com/jupoti/gummy_bear_wallpaper_android.pdf
    • https://s3.amazonaws.com/lezopobigeza/37252473099.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/counter_strike_source_admin_hack.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114ce.bin
287e766b1a92026bad1ec5d09a74ee4003813a4cdd8add24f8a80ed96c04f417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 5400 bytes
font_01_sfnt_off0001273d.bin
d26907917e9e25d187c2909c294c58d7e24a314abb85662565ed4a16ffb16e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 11288 bytes

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