Malicious PDF — malware analysis report

Static analysis result for SHA-256 1964e303de036d5a…

MALICIOUS

PDF

63.9 KB Created: 2021-05-31 18:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a7a62f46c6eda69d82a8a630c0a378 SHA-1: 55f8bac98ba73d9e05920a6b9296128e77fe19d9 SHA-256: 1964e303de036d5a3a0de4450d6eed47f9840f70c18df420c9d9ce170c2598c3
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9565

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-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
  • 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://coretry.ru/pbw?utm_term=sharechat+chat+app+ing+in+telugu+video+songs
    • https://static.s123-cdn-static-d.com/uploads/4454808/normal_60b318dc37c3e.pdf
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fdb3e4a1d670.pdf
    • https://cdn-cms.f-static.net/uploads/4465145/normal_605075660a31e.pdf
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/jomofumesalonobapomu.pdf
    • https://kademagora.weebly.com/uploads/1/3/4/8/134850034/zubotajepej_xisawelopetev_dozagiduvufil.pdf
    • https://tadiselugel.weebly.com/uploads/1/3/4/5/134589133/febodi.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fdadeffed683.pdf
    • https://jixevimevulu.weebly.com/uploads/1/3/4/6/134659689/dewuxusal.pdf
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fe2c7b44d33b.pdf
    • https://kofudoraf.weebly.com/uploads/1/3/4/7/134716635/969132.pdf
    • https://sutofuwanunow.weebly.com/uploads/1/3/0/8/130874369/gojigegudasetizoke.pdf
    • https://cdn-cms.f-static.net/uploads/4427273/normal_600b1b4b7bee6.pdf
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcdfac95bcd1.pdf
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/lamivave.pdf
    • https://burekanokem.weebly.com/uploads/1/3/1/0/131069897/6606388.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://natizasex.pbworks.com/f/how_to_help_your_marriage.pdf
    • http://pozapagula.pbworks.com/w/file/fetch/144417399/vopasadevupepakizoroka.pdf
    • http://kedetuwi.pbworks.com/f/why_wont_my_remote_work_on_my_samsung_tv.pdf
    • http://sejuworepow.pbworks.com/w/file/fetch/144419013/54771498722.pdf
    • http://viluxese.pbworks.com/f/how_to_exercise_transverse_abdominis.pdf
    • http://xedidovetaw.pbworks.com/f/what_do_blue_tongue_lizards_like_to_eat.pdf
    • http://lakebimutep.pbworks.com/f/88525280427.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa0.bin
acd9d81259d58baf3b19804870b3e4a89dc124179eee8a664716d72cfc5b8da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5500 bytes

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