Malicious PDF — malware analysis report

Static analysis result for SHA-256 106846f9c4c36ae1…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 17:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2d91085c7c351657be14ad211cd5dc SHA-1: 2e6b591e3ec562ab4f43b801a51da534dcce91ad SHA-256: 106846f9c4c36ae1f4c7289309c5f9b059af68ace3d0ccde9a05ec7d16b75e34
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing operation. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a 'Sense and sensibility sparknotes summary', likely a lure to disguise the malicious nature of the links. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=sense+and+sensibility+sparknotes+summary
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/zowowiluj.pdf
    • https://tujowijide.weebly.com/uploads/1/3/0/9/130969571/46980e07.pdf
    • https://vususujisalit.weebly.com/uploads/1/3/4/4/134490496/69098f1.pdf
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/sonesamag.pdf
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/8f1e56.pdf
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/7768460.pdf
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/sudor-niwixokibonige-mowajulelos-kaxepuledazogo.pdf
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/perapitu_nifizade_wikone_malexakot.pdf
    • http://zajowidased.iblogger.org/bedford_weather_report.pdf
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/4411811.pdf
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/vuwufojibakamawe.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/novigejopobasososu.pdf
    • https://nojupifidupo.weebly.com/uploads/1/3/4/3/134361410/8795629.pdf
    • https://wevuretadoza.weebly.com/uploads/1/3/5/3/135320639/1500686.pdf
    • http://rimaloxal.22web.org/online_ios_emulator_no.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_1b7b7fcbc66e43d085528d73b86b3743.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_68bea9e10c2547aca311441f390511c3.pdf?index=true
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_194e3e947180474ab5e64079353ec0b9.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_375e84610dd340a9b92ea0556c265a69.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_d0f24ea7428e4e398f262f962d7ad6fe.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_e31847c375394827a9069f6ef2c5ade4.pdf?index=true
    • http://kijemuf.epizy.com/entrepreneurship_grade_11_textbook.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_0cc2f159f70441d68872652608755f76.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_b3ff6f81889243e5a05c37fb7b437099.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_off0000e8e6.bin
b18a0ee287381c88ad4039ad605e29c39e9db8e5c8b0f86c474ed49dc2c3ef23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 5516 bytes
font_01_sfnt_off0000fb8d.bin
e58c2cae0673b5184de012b6ce932132b337a08ac76e4af70b43838dcebe297a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 10092 bytes

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