Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91cec0eada3044b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-17 19:23:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e86e52a6dc2bb02828be7dc232a0e59 SHA-1: 78c6cdd01862d2db96ecf657c1e396bd9eeb632f SHA-256: c91cec0eada3044b29d68e7ff60160f011ee6a3f83e6b67abcd0f93d3d5a8747
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 point to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains fragments that appear to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=the+way+a+mineral+shines+and+reflects+light+is+called
    • https://cdn-cms.f-static.net/uploads/4483586/normal_603b0a73f1ea4.pdf
    • http://worabipupe.mypressonline.com/7046033470.pdf
    • https://cdn.sqhk.co/nogegamapagi/jijwrij/lupujotalovaf.pdf
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/6bd4db6.pdf
    • https://cdn.sqhk.co/dilujuzaga/iggcOKg/game_dragon_kingdom_mod.pdf
    • https://cdn.sqhk.co/mifimafonuku/jyns3hc/baby_growth_spurts_adjusted_age.pdf
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/1089605.pdf
    • https://cdn-cms.f-static.net/uploads/4465259/normal_601a640039eb5.pdf
    • https://cdn.sqhk.co/junizafuzep/jeAficS/piano_sheet_music_zelda_ocarina_time.pdf
    • https://cdn-cms.f-static.net/uploads/4386349/normal_604018d1d93d3.pdf
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/2362899.pdf
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/1d231e334069.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_600a7922efeb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_acd72f9eb717466a8dfba4655a6ee5c6.pdf?index=true
    • http://defakulid.atwebpages.com/breckwell_pellet_stove_model_big_e.pdf
    • http://sinusudixuxuwad.atwebpages.com/how_to_make_diaper_genie_refills.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_1b15fbf7db8b428e87abb6ee76e24dba.pdf?index=true
    • http://dipulitexaxuz.epizy.com/cross_multiplying_with_variables_worksheets.pdf
    • http://folapalej.rf.gd/ateten_gmlek_inceleme.pdf
    • http://bemabam.myartsonline.com/devixatuzojekaritukesopo.pdf
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_98a0a83de9aa472885d63b2f8db92a92.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_off0000eba7.bin
d6461b6ad307dbf123a5d49a7a7dfadc5f91f99b1a5677c06ffd6b4cfd1548fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5580 bytes
font_01_sfnt_off0000fe8f.bin
52ed15b059f4256cc8dfa7c757f33d380ce53a82f881621ddc5f4779eb2854ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 11000 bytes

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