Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b94062ceccb9f8…

MALICIOUS

PDF

78.8 KB Created: 2021-02-27 09:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9df25abda66c88a2ecaf36eb598fde42 SHA-1: f267b09755f7213f8cfa8fdcd5fcfc98d40bf02b SHA-256: d0b94062ceccb9f8100cf7282a8c1ae9683beeb03b9c9e5ef2e984d0fcb230e8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains a heuristic firing for a large number of external links, many pointing to Weebly-hosted PDFs. The ML classifier also flagged this as malicious with high confidence. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially distributing further malware or phishing content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=reading+level+chart+scholastic PDF link annotation
    • https://pitazifuriza.weebly.com/uploads/1/3/0/9/130969431/936177.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/4058053.pdfIn PDF document text
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/6182289.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/nofilan-jukojitetazeban.pdfIn PDF document text
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/vesipabizo-vetexelipuner-fapew.pdfIn PDF document text
    • http://xisajole.iblogger.org/usb_barcode_scanner_android_tablet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478415/normal_5ff7d9164438e.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/935806.pdfIn PDF document text
    • https://rizogogitire.weebly.com/uploads/1/3/5/3/135323834/b62d9a7a5.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/sowesawibul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443815/normal_603068f7255eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6018af04bc790.pdfIn PDF document text
    • https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/20911d7361b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_5fd9428146504.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/novifamigot/wekipomegojuboresog.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/88233600371.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/nofisal.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/3989496323.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/instagram_profile_picture_size_circle_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/how_to_use_a_verizon_hotspot.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/dexusetevogulozunikov.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/arya_2_full_movie_tamilyogi.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_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 5268 bytes
SHA-256: 1647f2b7563336cfbd9f1588359b5a9162e9d0b822730e0f98438b6e41692ff6
font_01_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10240 bytes
SHA-256: 5043d39c0a36b1e2b82c3ae2e010f255bef1d084a5013aef7202c46afaf5e1b7

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