Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c79d024b424b779…

MALICIOUS

PDF

80.2 KB Created: 2021-02-06 12:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cce80b116438254b23b787278374080e SHA-1: b9567d7b710fa7b93ebb99bdab04b8170ce061cb SHA-256: 3c79d024b424b779f74aa587935972b55244df49fdd6040e2070a05a7ccb333b
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a potential SEO spam or phishing campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/123?utm_term=virginia+woolf%2527s+a+room+of+one%2527s+own+as+a+feminist+text PDF link annotation
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/5665122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_600bfdf267896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5fc5bd3f52e42.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/2854166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5ff2484b3be54.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/3188234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_601dda193a2ed.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/c16ad114492.pdfIn PDF document text
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/lokotepomosutade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_600bf592589fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63bb36a753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5ff5b71573c1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senusekavopodu.rf.gd/airmedia_freebox_revolution_android.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/11268890593.pdfIn PDF document text
    • http://mikobiduvug.rf.gd/bts_golden_disk_awards_2019_performance_full.pdfIn PDF document text
    • http://pibimosozo.rf.gd/kamalowisezitibepiginibiz.pdfIn PDF document text
    • http://kanuximus.rf.gd/nest_thermostat_installation_guide_us.pdfIn PDF document text
    • http://zobotipuzadevi.epizy.com/fikokevifojapa.pdfIn PDF document text
    • http://deketinak.rf.gd/alternating_current_examples.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 5248 bytes
SHA-256: 5cbe9a0c247e668166dbcafe91ae6d762a2f3c36da4a750f8556c1248352d63e
font_01_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 11312 bytes
SHA-256: 3038b34eb76c27745118b1324591621f448b820151780f93b3b0e3f86b0c2b95

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