Malicious PDF — malware analysis report

Static analysis result for SHA-256 8610e3bc51554236…

MALICIOUS

PDF

112.4 KB Created: 2021-06-04 15:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfb598236b235ee28c0967733c644fc SHA-1: 51a3d23f2caf997aecf72a4f7169759e277bc0fc SHA-256: 8610e3bc51554236b1e1516b64487dc6be4601f5287ef17c2cb1b4f1c8c502d9
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 pointing to PDF files, indicative of a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/pbw?utm_term=exercices+antonymes+cm2+en+ligne
    • https://cdn-cms.f-static.net/uploads/4449178/normal_6038647169770.pdf
    • https://suwodofiwimi.weebly.com/uploads/1/3/4/4/134495338/jagol.pdf
    • https://cdn-cms.f-static.net/uploads/4393489/normal_606e9bab0d208.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_60250507a3398.pdf
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5fc82893ba218.pdf
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/92e888f2ac.pdf
    • https://cdn-cms.f-static.net/uploads/4454822/normal_601366873375f.pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6040274e9eef2.pdf
    • https://cdn-cms.f-static.net/uploads/4413005/normal_60106a6492fb1.pdf
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff2241786401.pdf
    • https://cdn-cms.f-static.net/uploads/4492253/normal_602a0f81d2fad.pdf
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/gebemolifaliza_jexagatudo_gixido.pdf
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6020b80017e14.pdf
    • https://zemedefikejo.weebly.com/uploads/1/3/4/0/134040876/784eab.pdf
    • https://cdn-cms.f-static.net/uploads/4377933/normal_600dc7b4459c8.pdf
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6035f3a47d543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c378df75-f2a8-4798-95a4-132c0e398b7d/goxopo.pdf
    • http://nubuzefi.pbworks.com/w/file/fetch/144534057/rosewififegepanubodu.pdf
    • https://uploads.strikinglycdn.com/files/aa821442-90dd-4fa4-ab59-5050c69f178e/34007998127.pdf
    • https://uploads.strikinglycdn.com/files/f84d2878-6083-4229-aea6-aa6036040245/59312019128.pdf
    • https://uploads.strikinglycdn.com/files/c4f6632d-654e-44d0-929f-ef7ab99b8b11/gagivuwa.pdf
    • http://lakebimutep.pbworks.com/f/45837877842.pdf
    • https://uploads.strikinglycdn.com/files/c6c25298-be76-4faf-82c4-fb0a1db98055/dbq_12_the_industrial_revolution_beginnings_answers.pdf
    • http://mapijakemifo.pbworks.com/w/file/fetch/144434787/cicero_on_obligations.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cd9.bin
eadc4d80451c1ef916b558abeddc34235492cc514c872e761044380ad5791c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD9 5380 bytes
font_01_sfnt_off00016f24.bin
57f6cf7e4a1726d2780ceba9e68dd5502c52f408391d6d8f6854d964c3bc4032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F24 13640 bytes
font_02_sfnt_off00019a6a.bin
d6aeca2d71d065aeba00d03c50d672d3ba05f186ce264dc70760bb3990d11dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6A 16632 bytes

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