Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4530ccdc608382a…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cc89d1def18c4bcd3bc96acbdf1250df SHA-1: 5664245656604922e98d0be3495eb3ab140a0cec SHA-256: a4530ccdc608382a8cd497f80f3023b4c0f542b0638db553c3f90b900d7a8911
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to fixing a common household item to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=how+to+fix+a+hampton+bay+ceiling+fan+light+switch PDF link annotation
    • http://axacheat4.xyz/644560361330qyh9.pdfIn PDF document text
    • http://titonigofitazi.iblogger.org/autotransformer_starter_theory.pdfIn PDF document text
    • http://kupiokno.su/14282064886h3ft9.pdfIn PDF document text
    • http://sandwichhq.club/la_crosse_technology_alarm_clock_setupw1o7e.pdfIn PDF document text
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/c75ea44b.pdfIn PDF document text
    • http://silvanozito.online/best_restaurant_review_responsesl3ip8.pdfIn PDF document text
    • http://nibelv.xyz/rerizavumixajusemerimivukdkph.pdfIn PDF document text
    • http://fitokaps.xyz/senate_polls_by_state_mapzg4zg.pdfIn PDF document text
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/9cfce900f3.pdfIn PDF document text
    • http://pe50off.pro/panasonic_sr-df101_microcomputer_rice_cookerrh9te.pdfIn PDF document text
    • http://daselefufirapim.iblogger.org/autism_spectrum_quotient.pdfIn PDF document text
    • https://sozamevojor.weebly.com/uploads/1/3/5/3/135309273/fejow.pdfIn PDF document text
    • http://50offstore.info/clumsy_synonym_informallstav.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/ketapupuxinu.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/9691907.pdfIn PDF document text
    • http://vitalia-transports.com/pamaxugomerefel5f7u.pdfIn PDF document text
    • http://balifruit.com/57082932604yfw31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/pefoberixoje.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/dodge_avenger_rt_2013_specs.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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5696 bytes
SHA-256: db3cfd1f00279365d4a774eeed39462dae5d242754eb17547b4f513113f39d64
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10912 bytes
SHA-256: 50571ffe3229c9b0517fd22981d22a69f3e695a2973e1f7c4479e6b14295af2a

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