Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afcf709f03888e6…

MALICIOUS

PDF

72.1 KB Created: 2021-03-15 18:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 34e93947e6dd18aaca85902a7c0d89da SHA-1: 9f2a95cb9ec09d47dee92a20f18d0ab07959d7e1 SHA-256: 8afcf709f03888e62fac170ba3719e4b88a60561b790ff964e1fd91c77462c39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=article+a+an+the+exercise+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370791/normal_60125df466bb7.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/tabilibabini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fde2d1b2f285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fe0b19b0ce04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_60011cc37d17c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6049cdc6201f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fc5aef5a73da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495975/normal_5ffc66e4966ee.pdfIn PDF document text
    • https://zekawumili.weebly.com/uploads/1/3/4/4/134403966/sizatuzuw_sipuvaninisejep.pdfIn PDF document text
    • https://zexuboru.weebly.com/uploads/1/3/2/6/132683252/fasidos-wosodiza.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/paliluruzil-majinagikos.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/megepiteka_pukubukanobe_tonanegexav_vevuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_604b12caceb89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_6018e66fbb1c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04d8321-3e1f-4dff-9307-214e09e689c8/wixudajanuguzokataw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aa1125-a2b3-4b4f-beb9-74be27fa3362/smart_watch_phone_u8_bluetooth_manual.pdfIn PDF document text
    • http://sewexojin.rf.gd/sekolamixawiroxunipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922af798-2c57-45c7-9cf8-cb5a7659bb14/que_son_los_sintomas_de_mareos.pdfIn PDF document text
    • http://lojarine.epizy.com/android_game_development_java_or_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dd3f61-dbd1-417b-809e-4c161505276c/68563469337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734fac9e-7202-41f7-b0c9-77615582bdbc/93066239113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2155ae5e-07c8-4b54-9f99-d7f92446b510/how_to_convert_celsius_scale_to_fahrenheit.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 5300 bytes
SHA-256: 2e00314f236fc6845c86221151d7eaa4cb59f2279f06b79b32738a401e0b3df2
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 10252 bytes
SHA-256: 7c97c0e89fc56a57629f8ab539ba4d048e5d2bf148bebe5fb5ec3a12f72a14a3

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