Malicious PDF — malware analysis report

Static analysis result for SHA-256 706c19ae7f828d5b…

MALICIOUS

PDF

105.8 KB Created: 2021-03-20 23:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208d2b730459bde79cf462122650100f SHA-1: 74286dfe7386e37d943ddb98ea0a24b578ff2b14 SHA-256: 706c19ae7f828d5b0ee0eccee6d75e9f8a44064f15b5cdf4bc8d315d773e4677
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a PDF link farm. It contains numerous external links, including suspicious domains like 'kuzutuzo.ru' and 'getenjoyment.net', suggesting an attempt to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=hebrew+new+testament
    • http://kixurox.getenjoyment.net/bobarijozojabowop.pdf
    • http://tijukilebag.getenjoyment.net/45834290625.pdf
    • https://static.s123-cdn-static.com/uploads/4454049/normal_5ff67723a84a1.pdf
    • https://sodujamewo.weebly.com/uploads/1/3/4/7/134750465/dasonukovemofe.pdf
    • https://dosujuge.weebly.com/uploads/1/3/4/3/134305565/baviwi.pdf
    • https://cdn-cms.f-static.net/uploads/4366024/normal_60553043c0f1e.pdf
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/2511180.pdf
    • https://cdn-cms.f-static.net/uploads/4482207/normal_600dfaf79e314.pdf
    • http://pugezesiw.mygamesonline.org/21952744023.pdf
    • https://cdn-cms.f-static.net/uploads/4424645/normal_6009ed7b7fcf2.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/fowaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suximawo/bejixinufuvosiwugufavanud.pdf
    • https://s3.amazonaws.com/bidivo/saxesikisetigewux.pdf
    • https://s3.amazonaws.com/vinejivunitego/45968461139.pdf
    • https://s3.amazonaws.com/kuxegu/formule_avantage_en_nature_voiture_2018.pdf
    • https://s3.amazonaws.com/sefepugolupalax/avenging_spirit_rom.pdf
    • https://s3.amazonaws.com/xukanomarexumu/upsc_cds_answer_key_2019_paper_2.pdf
    • https://s3.amazonaws.com/degagaziv/memofovuwagata.pdf
    • https://s3.amazonaws.com/muwemivumazulax/journey_to_the_center_of_the_earth_book_jules_verne.pdf
    • https://s3.amazonaws.com/nefagolom/academic_reading_practice_test_4_answers.pdf
    • https://s3.amazonaws.com/tosevud/74765311645.pdf
    • http://xenezipulugiji.atwebpages.com/kimizene.pdf
    • 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_off00014ea5.bin
fe94aa3898117323e762be6d8c6fabed19ee34a837a9538e41ff12b8a29405a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA5 4992 bytes
font_01_sfnt_off00015f94.bin
5b209a676111ed83e37a7a603d9ef80872765280db9c906a0eb6ac41708ac5b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 19560 bytes

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