Malicious PDF — malware analysis report

Static analysis result for SHA-256 782a6e13d537081c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-30 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00eaae1f8284b7ad6db963e9c91bc266 SHA-1: 255bfd37fd947c371b76e72810bca3ccaf30da6d SHA-256: 782a6e13d537081c44072ddcbd861a61146964d26b343e333859fbef9ee509f4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'computer networking terminology glossary pdf', aligning with the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=computer+networking+terminology+glossary+pdf
    • http://nukels.xyz/buck_converter_switching_waveformsmm37b.pdf
    • https://dudatagavadupim.weebly.com/uploads/1/3/4/4/134402573/sexos.pdf
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/e0e6f8.pdf
    • http://gibelineg.sportsontheweb.net/lior_suchard_mind_reader.pdf
    • https://static.s123-cdn-static.com/uploads/4374968/normal_5fcd4182a3275.pdf
    • https://cdn-cms.f-static.net/uploads/4414360/normal_606bfbb677c45.pdf
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fdf9f738f78b.pdf
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/7699432.pdf
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/4b0c6683a2e7.pdf
    • https://cdn.sqhk.co/konosoka/jjPjVY3/parentvue_fcps_whitman_college.pdf
    • https://cdn.sqhk.co/sugumujozik/f3jjifz/iti_original_marksheet_image.pdf
    • http://domsale.xyz/negative_binomial_distribution_explainedaio55.pdf
    • https://cdn.sqhk.co/levuzivanu/ggChgie/last_of_world_survivors_dead_walker_wars.pdf
    • https://cdn-cms.f-static.net/uploads/4426967/normal_602f6fcb096f5.pdf
    • http://idealslimitaly-ufficiale.site/how_to_write_a_franchise_operations_manual6p25i.pdf
    • https://cdn.sqhk.co/gejupajo/ySNieid/oracle_hcm_cloud_payroll_reports.pdf
    • http://lobabinuladeri.medianewsonline.com/naligibarubuvopatejilim.pdf
    • http://rawenspant.online/offline_gps_navigation_app94c9e.pdf
    • http://jinevul.mygamesonline.org/asymptotic_notation_examples.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_604dea81450a1.pdf
    • http://tehnopolis.org/1169806483602puy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f618.bin
775c540d51fa899d00101d94d517743184fba8df632f564deb6af0621d9e0a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 5524 bytes
font_01_sfnt_off000108ea.bin
9e8a5d28eb4fc63e58804783c6a17566464e2c1e0bcfdc0e16eda485c611f635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 10892 bytes

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