Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c1a9d8a34e9e53…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 02:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97419adfc7d0bf44430d0712143a5cd8 SHA-1: 509246ac49523df1662912dd22035a44694cf0a0 SHA-256: b1c1a9d8a34e9e530b631cdaee9cead06aafe216baf561504fe6bc5fcf49f2d0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, 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 phishing or malware distribution scheme, likely using embedded JavaScript to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/123?utm_term=libro+minimalismo+pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/risen-ruvij.pdf
    • http://bekemewoxuj.22web.org/nizujafazelok.pdf
    • https://cdn-cms.f-static.net/uploads/4421613/normal_604cd5533feb8.pdf
    • http://amin-ukraine.net/conchita_performance_eurovision_2019xbv3b.pdf
    • https://cdn-cms.f-static.net/uploads/4387573/normal_604870c926bc3.pdf
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/kepixatexaliver.pdf
    • http://tryici.xyz/xopopedodosokekisej27ek.pdf
    • http://tekplafond.xyz/kegikonzp258.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fdb61e9758bd.pdf
    • https://zubisixoligifi.weebly.com/uploads/1/3/4/4/134479514/zirexubuvarurar.pdf
    • https://cdn-cms.f-static.net/uploads/4499660/normal_6014a0d0f0db5.pdf
    • https://cdn-cms.f-static.net/uploads/4387406/normal_6052079b27d2a.pdf
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5fe0487c31141.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5feddf01ebdfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_8d08b5c28f7347a19f86bcac25c3ffbe.pdf?index=true
    • http://gevalinuke.epizy.com/a_t_robertson_word_pictures.pdf
    • http://vefilemegukur.epizy.com/92679801959.pdf
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_578d6194dca94556843a13f5cffb4499.pdf?index=true
    • http://nifiloxoburufi.rf.gd/yaseen_shareef_urdu.pdf
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_d2e0df8af8a947478762f6c7816b39a5.pdf?index=true
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_9601a8fd01234f2f979f13731ecd9faf.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_09ee6ea1af0043dba1a1c97b21c64c41.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_off0000e98d.bin
16b400cf50b04cd32905993a690093074b7037205929549cd1db896896eb6cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 5268 bytes
font_01_sfnt_off0000fb58.bin
55d9d58cdca0c926f4d3a21e14243bc5917dce780ef3f7d282d198ce940bb7e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 12452 bytes

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