Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c0aeadcf7d8e59…

MALICIOUS

PDF

62.1 KB Created: 2020-11-26 05:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cfaf29091e0c0b8a241500cb519fac45 SHA-1: 132d322a3db0f9e68f71dc57ca650118da916fd6 SHA-256: 79c0aeadcf7d8e59676695453c743db9ed0bff744f38891650a81fbd6adc8e6e
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffking.ru/strik?utm_term=dimensional+analysis+practice+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416654/normal_5fb8a6fb87b5c.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/8130356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f8c9a62c84f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5fbe9b8fa6660.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/ba2eb056-a101-4063-856a-1317ab87cbd2/translating_words_into_math_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba64966-ed34-40e2-9eea-e45678ad8d21/61169447911.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/wepiwaxivabutu.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/logistics_supply_chain_management_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd3f116-61b2-4d04-b01d-45fc9faf29ab/35068062122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46381c0d-1f62-4e5a-bd60-1897ead6cd98/geometry_b_midterm_review_packet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/82736779915.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/nadulaxurazefipujo.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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 5336 bytes
SHA-256: 1d3429fe57f03473ad54cda83d826f5581746a82825249cfe5020fc649bfb553
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 9976 bytes
SHA-256: 072bc49bd8063e9168f272800e6503a9c4bf82778482c461bb45e29c8cdb6154