Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea02dee20e51367…

MALICIOUS

PDF

80.9 KB Created: 2021-02-22 17:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 665a99a33c71fc3230373640429c35cd SHA-1: dbadc1a4115dd810539b9c53fb7453bf66f2b211 SHA-256: bea02dee20e51367cbdf90d4d3d9f24ba464a56943e83f1568e449c9ecb630d3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or drive traffic to various sites. One prominent external URI points to 'https://leonvi.ru/strik?utm_term=windows+automated+installation+kit+%2528aik%2529+supplement+for+windows%25C2%25AE+7+sp1', which is likely a lure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest a potential for malicious JavaScript execution, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://leonvi.ru/strik?utm_term=windows+automated+installation+kit+%2528aik%2529+supplement+for+windows%25C2%25AE+7+sp1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370064/normal_6017343fa66f8.pdfIn PDF document text
    • http://reweder.site/718879776609pz63.pdfIn PDF document text
    • http://fimewot.xyz/pillow_talk_mp3_downloadvbqnj.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/9475dbce4009.pdfIn PDF document text
    • http://gakivako.iblogger.org/wefezebaziwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fcb2e26b43c3.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/retaperuv.pdfIn PDF document text
    • http://tubatil.iblogger.org/king_size_bed_sheet_size_australia.pdfIn PDF document text
    • http://kelnoteres.xyz/489185033875578c.pdfIn PDF document text
    • http://rukozhop-guide.com/chicken_sandwich_near_me_delivery25eqz.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/jifesu/fokakadazilubapi.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/affairscloud_current_affairs_october_2018.pdfIn PDF document text
    • http://todinig.rf.gd/transport_canada_flight_test_guide_commercial.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/adaalat_episode_137_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/amrapali_new_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/class_8_maths_rational_numbers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/81313188851.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/mikubamizedoworuzin.pdfIn PDF document text
    • http://negavutagogo.epizy.com/007_blood_stone_pc_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/jokuxaxogugaginogojebag.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_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 5884 bytes
SHA-256: 576afe53342e08387ab325358680ac0d7960c390a611631e7fd24b4336717a95
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 10432 bytes
SHA-256: 97f362c9ed799e0aaedb0177286cc3a6dba98d2b5fb3504ed91c5e561d22f3d6

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