Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c91063bbfa1c8…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 17:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c48c56426f5d3511099643f6408d079 SHA-1: 7f8e1954e1ee915d508378f1a02307b8db64acc0 SHA-256: f85c91063bbfa1c8c2c1eb9e3247ee356e5ccdf291ae52db924cf0c694e2275a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm designed to drive traffic to malicious or spammy websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution attempt. The embedded URLs, such as https://ponafet.ru/award?keyword=cds+1+2020+notification+pdf+upsc, are used to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=cds+1+2020+notification+pdf+upsc
    • https://surarapumo.weebly.com/uploads/1/3/4/3/134305151/ef9389b.pdf
    • https://cdn-cms.f-static.net/uploads/4420018/normal_601aced667762.pdf
    • https://cdn-cms.f-static.net/uploads/4393925/normal_603676947ed9c.pdf
    • https://static.s123-cdn-static.com/uploads/4366031/normal_5ff9ba9d2c390.pdf
    • https://static.s123-cdn-static.com/uploads/4498348/normal_600646ab36178.pdf
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/9760665.pdf
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60141b253e310.pdf
    • https://cdn-cms.f-static.net/uploads/4446017/normal_60642a3bea307.pdf
    • https://nedovena.weebly.com/uploads/1/3/4/5/134528917/44b424bbbf.pdf
    • https://static.s123-cdn-static.com/uploads/4497346/normal_5fcc5412dd04f.pdf
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/lexeda.pdf
    • https://cdn-cms.f-static.net/uploads/4409799/normal_6031120e56d4b.pdf
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/mafomixitolali_nipuz_sulot_maralave.pdf
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/dogejovu_natewexatipurur_dimefuwitepuxa_mawupofegowiler.pdf
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/e39816aaa.pdf
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/99186b01.pdf
    • https://cdn-cms.f-static.net/uploads/4408586/normal_601f2f01acb89.pdf
    • https://cdn-cms.f-static.net/uploads/4456728/normal_603b638106ee3.pdf
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/6a6e0e0b8be1ad9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_0f620cdbd8e54d269bb2e38666c95183.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b39f36e9-3687-4898-b841-a1454e46e5c6/loxirerugigogi.pdf
    • https://uploads.strikinglycdn.com/files/f6df0a96-ab2a-454b-85db-17b5da74ecbc/42309340802.pdf
    • https://uploads.strikinglycdn.com/files/8ee773b1-b441-47ff-8dfc-20e10dce32c9/pedal_power_2_plus_mounting_brackets.pdf
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_3b06e6f6c19242958d86cec0685f95d6.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_127b8d2334b94d719de60daadb741fed.pdf?index=true
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_abea854b7f3f42e381305e4e6a24020d.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_284ae387b4df436fb89e3d7524b86b4d.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_off0000ee6a.bin
cb5b1180553d4099550263493f7c724438338b30e4c0206e1609e4e5591425aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5252 bytes
font_01_sfnt_off00010063.bin
a43ef544bc10441ddc127965e2d6d4ae0a1fc40a884deeab1a00079adb3895ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 10936 bytes

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