Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5fdbfc120db9e2…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 13:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0d92d8a8c4d06438972dbe949b2dba3 SHA-1: 88bf6035c25e007f9720f2f7b7d7b5570cda9a54 SHA-256: 8f5fdbfc120db9e2cd28e8b0d2f0e4cbf7b3fda226c53eb31b9a88778bfd4cf5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=how+to+do+calligraphy+with+brush+pen
    • https://cdn.sqhk.co/foxoxaze/hIJKPCk/22751261141.pdf
    • https://cdn.sqhk.co/mojafefegamo/uhwjjig/coder_mip_app.pdf
    • https://xixunogada.weebly.com/uploads/1/3/4/3/134343035/3539031.pdf
    • http://compte-cmbretagne.best/ketewukunanis8ql6f.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/9746314.pdf
    • https://cdn.sqhk.co/vefasebo/e0jigZT/flying_monkey_beer_ipa.pdf
    • http://miwasigal.mywebcommunity.org/pivuvaxipapurisa.pdf
    • http://bifitiguz.iblogger.org/house_ordered_from_sears_catalog_in_1920s_still_standing.pdf
    • https://cdn.sqhk.co/tosilura/bFhagdm/mini_basketball_hoop_with_nba_stickers.pdf
    • http://galosidijixiwu.mypressonline.com/41124587298.pdf
    • http://bostpolamos.site/vavurirofoxu2o5b2.pdf
    • http://durebemidiges.getenjoyment.net/gikilateweteropeforiko.pdf
    • https://cdn-cms.f-static.net/uploads/4470542/normal_60240d734a80a.pdf
    • https://cdn.sqhk.co/kinanekoxo/djfhijb/redcon_pre_workout_stack.pdf
    • http://pigalimiru.medianewsonline.com/12762344780.pdf
    • http://sesaruzuvibi.22web.org/wafiwoponoxi.pdf
    • https://cdn-cms.f-static.net/uploads/4454556/normal_604062544eddb.pdf
    • https://cdn-cms.f-static.net/uploads/4459322/normal_602d9e866810a.pdf
    • https://static.s123-cdn-static.com/uploads/4476301/normal_5fcbcb085b8b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gibevupotomozom.rf.gd/23858091273.pdf
    • http://dofumuligo.rf.gd/bimoliw.pdf
    • http://zogivumomu.epizy.com/avicenne_energy.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66a.bin
08db62f1094f6c5f25543f3a5dafae8cda203a8c7fe310bbe52d74aa08ab97fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 5512 bytes
font_01_sfnt_off0001092f.bin
7d9f2edd0f8a5ea9c522497de5617ed4346c2b887385645516a9687207067a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10800 bytes
font_02_sfnt_off00012e3d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 4324 bytes

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