Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8430072628efae…

MALICIOUS

PDF

113.7 KB Created: 2021-03-07 23:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac477f7d0f591064c20afcb80cdd2bee SHA-1: 619ded80697ea65241e6bf31b3a1511c76cd40a5 SHA-256: 5b8430072628efaee130c17a0ddfc1d44b3cf35331eaf8d91ac98c9a4cd193b1
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like weebly.com and sqhk.co, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/aws?utm_term=v+for+vendetta+words+will+always+retain+their+power PDF link annotation
    • https://cdn.sqhk.co/wejafivelij/eja9jhc/banuvu.pdfIn PDF document text
    • https://soxulemum.weebly.com/uploads/1/3/4/5/134506395/zabozukukoxamipuju.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/6505035.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/iJjgtQt/40329761200.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/grammar_english_book_class_6.pdfIn PDF document text
    • http://iciko.xyz/2000_dodge_dakota_repair_manual_free_downloadu2pjq.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/9976889.pdfIn PDF document text
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/bitepaxuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xexogataza/hjgenjj/degelirinedub.pdfIn PDF document text
    • http://bitcoinchat.fun/3342272704ur25x.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/RYyMJpu/53067557157.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/cuszihJ/world_cup_1990_qualifying_concacaf.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/b4d99f66.pdfIn PDF document text
    • https://cdn.sqhk.co/vegapagir/iaqpngg/11285136218.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/cigKmBC/robin_ai_voice_assistant_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/bhghpja/75414889082.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/67306080586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revipopeguxasaf.epizy.com/cpm_chapter_4_test_answers.pdfIn PDF document text
    • http://nirozat.rf.gd/gisuv.pdfIn PDF document text
    • http://wajufuful.rf.gd/how_much_is_rhonda_byrne_worth.pdfIn PDF document text
    • http://momalovategur.rf.gd/21439966504.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/embryology_ib_singh.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_off00018140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18140 5348 bytes
SHA-256: 26a3617c0b659fb53f053e93817f20a28bfa356173a0e7daf310d90c332d3a27
font_01_sfnt_off0001938a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938A 11516 bytes
SHA-256: a0cae906c84e4352aaf0ba233398b9f444c1f5f2db97c1b2867e4f89f413a52d

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