Malicious PDF — malware analysis report

Static analysis result for SHA-256 388dc82b72d0af5d…

MALICIOUS

PDF

81.1 KB Created: 2021-01-18 19:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 430392cf4096ae47962f57eefb62d189 SHA-1: 90d0122c5f779dc1748b4a203652e4555eba9d84 SHA-256: 388dc82b72d0af5d5978ee8bfee9e379ffb8c4b8e82e43366be800ceadb878b8
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, a technique commonly used to distribute malware or redirect users to phishing pages. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=unblocked+music+download+sites
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/kutogapexeri-jilat-tixex.pdf
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ff14953add0c.pdf
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8e158dc8d29.pdf
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5fb545f8aee84.pdf
    • https://cdn-cms.f-static.net/uploads/4404292/normal_5f93aeac61921.pdf
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5feb268d41f4d.pdf
    • https://cdn-cms.f-static.net/uploads/4494147/normal_5fad75a73986c.pdf
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/8011427.pdf
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5feee021359aa.pdf
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f8e791d7857a.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/sabimugoradoviwunutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fufibilola.epizy.com/delhi_belly_movie_free_mp4.pdf
    • http://jovigoxuja.epizy.com/33300285934.pdf
    • http://veruzixiki.rf.gd/producers_livestock_auction_market_report.pdf
    • https://s3.amazonaws.com/winumigutam/jumble_answers_for_10_30_19.pdf
    • https://s3.amazonaws.com/remeranexe/customary_law_book.pdf
    • https://s3.amazonaws.com/zetare/accidente_laboral_definicion.pdf
    • http://mevonaku.rf.gd/41996234456.pdf
    • https://s3.amazonaws.com/womirofop/minivejujejasapinarox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010d.bin
e7476599ffa0343cae39028508573f93be9d3f7702c95438a590c2f32ce9e834
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 5276 bytes
font_01_sfnt_off00011303.bin
147f4ed39257aa3637faff68eb98d8e2b52cf6e8bbc3ddd207a442a7d6c3ac12
pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10572 bytes