Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0e0b9ecab03516…

MALICIOUS

PDF

78.1 KB Created: 2021-04-11 01:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 823f1e255f99f5c5511d9b7f90c6a5a7 SHA-1: 7490263a72aee1b4e63651b9ff0140ba699e2c0a SHA-256: 4d0e0b9ecab035165302540eee6f84b9528fb641052bc1d42a5fda579445132e
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 hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=symbol+ls2208+laser+not+working
    • http://magnifioco.site/604097775747xq0k.pdf
    • http://mon-cmbretagne.com/28831492945570o9.pdf
    • https://cdn-cms.f-static.net/uploads/4446400/normal_6039024e5f70d.pdf
    • http://winoraama.space/top_100_horror_movies_posterwey9d.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_6006a5daecccc.pdf
    • https://cdn-cms.f-static.net/uploads/4447253/normal_601fafecca817.pdf
    • http://robolab.one/sonuwezege24hfb.pdf
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff6d02c35b68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_9a0a8ca108644b1ea1188976fdb93be8.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_a77e5b88198c42748849646494bda9fe.pdf?index=true
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6139509ff44146e897167d10ffe90b77.pdf?index=true
    • http://baniteb.epizy.com/hernia_umbilical_e_inguinal_pediatria.pdf
    • http://gonurorirezode.epizy.com/post_office_large_letter_size_guide.pdf
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_70d3139a704848ef869ce4a1a37bc712.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_2515f9ce0d1e457e8a501d7b5eee1607.pdf?index=true
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_6f190e43612049dea94af2712f0d9d1c.pdf?index=true
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_f53255454c7b456386f935cb942f6c75.pdf?index=true
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_d3bb993ca9d648c791972a815ecd9529.pdf?index=true
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_64b09770c7734ab682c3e0aef4da2e7d.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_off0000f313.bin
d9f246f4747bc66b20971f5bdd9c004ae9badc7a9a0a645b781dc2c8d5789cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 5972 bytes
font_01_sfnt_off0001076b.bin
3ade5fdeb08d7766c2a144b6d19aac1e3af7a74b95ae76c11f660de0214e67ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 10492 bytes

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