Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb00b0a44042437…

MALICIOUS

PDF

106.1 KB Created: 2021-03-19 16:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f790d3aa51dd72526e29706bba01784f SHA-1: e1ff1584018799b5fe2354d16660ac8ccac36af5 SHA-256: 0bb00b0a4404243793a969d100a99879c20faba3bacfe44cb4873bfa9e4c6b7f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URIs point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://jumiwimov.ru/strik?utm_term=the+8th+army+blue+book
    • http://fimewovoko.getenjoyment.net/rederasek.pdf
    • http://mitatufemojo.iblogger.org/national_geographic_learning.pdf
    • http://zasufigonibat.getenjoyment.net/inferno_dante_alighieri_italian.pdf
    • http://warixedivukinat.mygamesonline.org/ralph_waldo_emerson_death_poems.pdf
    • http://fukuzowi.sportsontheweb.net/alcoholismo_consecuencias.pdf
    • http://zupaxowo.22web.org/3d_photo_android_app.pdf
    • http://bomufofo.iblogger.org/28388408761.pdf
    • http://xesubixuj.iblogger.org/the_boy_in_the_striped_pyjamas_short_summary.pdf
    • https://cdn-cms.f-static.net/uploads/4470521/normal_5fe829525da2c.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_60196e64b45f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_b3b1b99e9baf4de29d16c720800f31e0.pdf?index=true
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_fecf55eae5ac4ebcae36e8b954cd4cc6.pdf?index=true
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_e1584df4bdb84a1cb3866b878331cf9f.pdf?index=true
    • http://robexekipojop.rf.gd/notice_of_maternity_leave_letter_template_uk.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_55f784af8d60467396f7bfa2c9adcc54.pdf?index=true
    • http://nabifasilazug.rf.gd/letalusixenip.pdf
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_2923cb36b96d4758bf854d601dc29e64.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_37e0b6e1abb9414e8980da0893e5e4e8.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_77b6768ea86a49888248e63d2c73daff.pdf?index=true
    • http://ketabigumowun.atwebpages.com/giguwexuzorobi.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_8a9301ac416e41b8a766fc23c60532dc.pdf?index=true
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_4695371bff7845b5a46417681e4e6379.pdf?index=true
    • http://dukowuvizo.epizy.com/zofipanopebawavudusire.pdf
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_267bf5f5990d48018b5820a655d27000.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_off000162b2.bin
189b8482544414b20d18739cb84a48a3786d2af9c78ae03e6b7dc974706cd825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162B2 5196 bytes
font_01_sfnt_off0001743c.bin
c42e9e9018f3571957f8ff56c678d33b4aef5a14101001c63f799a0673c05cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1743C 11012 bytes

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