Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0a88b5b2fdf9fd…

MALICIOUS

PDF

89.2 KB Created: 2021-03-17 17:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cf1aee8c60a6b32be42a93ca2f5227b SHA-1: e3412f4bd6f2b275695897d3df821db4db13e2f4 SHA-256: 7a0a88b5b2fdf9fd9e09daa6e9659d91bc28476e383d83c2b5d789e2b3c38157
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, exhibiting characteristics of an advance-fee scam. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document's structure and the presence of numerous external URIs indicate it is likely part of a phishing campaign, potentially exploiting PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://pelibifir.ru/strik?utm_term=college+lacrosse+training+program
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/zokegowit.pdf
    • http://texno3ua.com/82435619985zxm7o.pdf
    • https://dixosupisuboju.weebly.com/uploads/1/3/0/7/130776754/6629587.pdf
    • https://static.s123-cdn-static.com/uploads/4401732/normal_6007a7d734ba6.pdf
    • http://hardcreditcheck.info/how_to_get_depth_in_drawingp22u7.pdf
    • https://naxabofufakuwo.weebly.com/uploads/1/3/4/3/134330868/danavubeneguvi.pdf
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5ff0d3fab96df.pdf
    • https://cdn-cms.f-static.net/uploads/4499282/normal_601bd1ec44a2d.pdf
    • http://kadanijojabuf.mywebcommunity.org/sennheiser_hdr_175_ear_pads_australia.pdf
    • http://zodatowafe.getenjoyment.net/what_is_phrase_structure_in_syntax.pdf
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5ffa8547f3c0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_08b16133ca9f4c0baa9e39750c634dbc.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_9a154341691c413d88109d0834af858c.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_e77be272dd5741d3bc976377896f95f4.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_954e017a73ba4dc1965e9b40746293cb.pdf?index=true
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_30cec261b0ef416abaf27b5a2b0394ac.pdf?index=true
    • http://bodegifu.atwebpages.com/tarot_zyx-gs_manual.pdf
    • http://zagofij.onlinewebshop.net/how_much_do_occupational_therapists_earn_a_year.pdf
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_98a2b73159af41ab824e11c8e968a122.pdf?index=true
    • http://kijonag.onlinewebshop.net/ejercicios_resueltos_de_centrales_electricas.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_89df4aef3f134fdeb7271d6c010dacfe.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_off00012011.bin
d4699ebcfb4e617cb0b479298c885115bd03a9148b94999059f438be37042a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 5156 bytes
font_01_sfnt_off0001318b.bin
884d45a0368ad8cf53d24b21de358b2a5dd3f6acbc556ca7a47bb30830087082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 11048 bytes

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