Malicious PDF — malware analysis report

Static analysis result for SHA-256 70682d80d409a7e5…

MALICIOUS

PDF

43.1 KB Created: 2020-11-07 11:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1dec75c7eabb0b91d4b0dae275b0be22 SHA-1: 1e085f80631f102068a8451f356b1dedb1e901be SHA-256: 70682d80d409a7e5735e158dbc299bbf687b7d9d1683782f7f1ea1d6833b7821
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs, including one pointing to 'trafftec.ru' with a 'turnitin login psu' keyword, suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafftec.ru/123?keyword=turnitin+login+psu PDF link annotation
    • https://mizemetugez.weebly.com/uploads/1/3/4/3/134322353/80bf6183f7873.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/zojoramelilod_vuzaxedijid_kusakebu_kojofojugigusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8759a725fb8.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/5f56fc907.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/sabidokokekatuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f91f8b824b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f91d2a53e774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5f91197462e22.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://zixixesowaxa.files.wordpress.com/2020/11/90485526055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e6db2c-8855-4b57-9146-c98042a253ec/45144901378.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/feneteduxuzemegodidedudun.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/ferusawotomonefuwizax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4701578a-ae07-4852-b487-e66efa9f9dfd/10536841045.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000065f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x65F6 7180 bytes
SHA-256: b1b2bc07a35794e149f99def61d54bf65dc5aa21ae8a927f57152f93004281d2
font_00_sfnt_off000055d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55D7 4724 bytes
SHA-256: eb0377732df1954c7b062273ecd7fbf66e137a3bcfb030ff174870fb694bca64
font_02_sfnt_off00007986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7986 11616 bytes
SHA-256: 258c64d9793971589bab621ce66424fec6934da4c1fd05ee235724be4d37b93c

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