Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b31e58dcbcbc888…

MALICIOUS

PDF

76.1 KB Created: 2021-03-13 23:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d630291b016f1907c7bc0e6417cf2d4e SHA-1: 966295e332622730cf9887eb5f868501d169b194 SHA-256: 1b31e58dcbcbc8883f6404c9876b69fefa41442564d30f1088bdae6120714c1a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://pelibifir.ru/wix?keyword=java+complete+reference+10th+edition+price+in+india PDF link annotation
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/popowaxonutod_jefavoj_kutexazin.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/basic_chart_patterns_technical_analysis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459777/normal_5ff65558f17d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fd201dec63bf.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/gadubo-senosere.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490377/normal_5ff5878a4dd29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_6022bad6adef4.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/8046922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_6009fe4841feb.pdfIn PDF document text
    • http://pomulagija.iblogger.org/30169730101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_602d719f42bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_601521d948f82.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/what_is_leave_travel_allowance_in_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_55ded541b95a4aec8d8a6122beff985d.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_89631f58c1df4431af623a4566b08e5b.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_a6bafd4af6ec4a829c9de53d8798ba12.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_3f81977da7ec4458bcbe0eea9efb5de1.pdf?index=trueIn PDF document text
    • http://nemunuj.rf.gd/werunumuxobipelepalumo.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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 5460 bytes
SHA-256: 1c4a90c25f312ea8ce89f57980d48bc17eb170626aec84d23dbaae0db4393311
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 11020 bytes
SHA-256: 748cbfd70e740dfac11973e3a9cdedae20aeb74180dc8ec528b9202d975bda30

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