Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eb359f7ae086f0…

MALICIOUS

PDF

74.7 KB Created: 2021-03-06 02:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a851d7d17bb8b773cbd60c6e4b9dfe SHA-1: 973b5c66bac9872795f4d222abe38ca8c9f0de3c SHA-256: f4eb359f7ae086f0e551893e86f7d2d5f8a1f1af8061c83022c56eef156fa05b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, and includes a visual download button lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. No scripts were extracted, but the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/wix?keyword=showbox+apkpure+5.34
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5fec3cc90f6d8.pdf
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd2bfb10b496.pdf
    • https://cdn.sqhk.co/rikopekela/gDge8Kx/pharr_road_animal_hospital_inc.pdf
    • https://cdn.sqhk.co/tifobebe/ihbiihc/wingsuit_simulator_sky_flying_gameplay.pdf
    • https://static.s123-cdn-static.com/uploads/4466666/normal_5fe13564adb00.pdf
    • https://static.s123-cdn-static.com/uploads/4416664/normal_5fef0eaf76402.pdf
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5ff15f236dbfb.pdf
    • https://static.s123-cdn-static.com/uploads/4484383/normal_5fdcdd9ec5034.pdf
    • https://cdn.sqhk.co/tedalome/gZVxjgJ/sosonedelepekimigu.pdf
    • https://cdn-cms.f-static.net/uploads/4455645/normal_601519f1df6e7.pdf
    • http://xafopawiki.medianewsonline.com/elements_of_a_film_review.pdf
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6013c17e9bd44.pdf
    • http://majikok.mygamesonline.org/fozumududub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jipowumat/nelemuvijelukavona.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_bdad569b86524be88d3fdc68bcd8ceee.pdf?index=true
    • https://s3.amazonaws.com/xoguwavosuje/maharishi_trousers_size_guide.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_34cd9ea7cc714fb6a0c11637ea57c748.pdf?index=true
    • 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_off0000e73a.bin
223e372cd44d59741bfa9ad6303879e390596d7d76959caaac8d7f66cc43805b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 5572 bytes
font_01_sfnt_off0000fa51.bin
02fa3b3d31a9cbc54ae28ec0a968a52e7f0b0aa09f316f85ba83d6001898a7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10348 bytes

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