Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cdc60e4f2d3fb7…

MALICIOUS

PDF

54.7 KB Created: 2020-11-07 20:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5269ad6c86d8e478e8ec366485f51a3a SHA-1: 216424f20699e478b837c8fc9d02766b76fe781c SHA-256: 41cdc60e4f2d3fb7590a20c7949c85e2fb40d5afb9c35d6caa3f35f47f97de14
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 1.0000

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://trafftec.ru/123?keyword=stree+full+movie+watch+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f94d605c9542.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/jikixun_manunun_vixajuxonezu_riwuloxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5f94656833f7d.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdfIn PDF document text
    • https://defagetomorig.weebly.com/uploads/1/3/4/5/134576552/fevere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f973fdf5e6fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f88f22042777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5f9c155ea965c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f9af41251513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f99086039d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_5f91825525a7f.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/gosiwadoluso_niwikuxaji.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/tetazino/pokemon_regions_based_on_real_world.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/western_union_pay_day_loans.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/kojubipa.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_off00009812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9812 5196 bytes
SHA-256: 24618aa66746362c79466431dae07fc3b06d723bc78ead566dd6274f5e8905f4
font_01_sfnt_off0000a9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AA 10552 bytes
SHA-256: 383e60d398139f005f782e56a5f673a398f07901f9c8007b41a9febde7834339