Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef9fbe00e488770…

MALICIOUS

PDF

53.3 KB Created: 2020-06-10 12:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343e02fce21d1d887a857c4e829f04a7 SHA-1: c36b08aaaccd75d5be1677df1841ea32546d4cf4 SHA-256: 2ef9fbe00e4887708db7232640ee60ac3783467d125282a18e1f58de160c3553
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm designed to manipulate search engine results or to distribute further malicious content via the linked PDFs.

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 http://bobbiandpin.com/uploads/1/3/1/0/131071312/131071312.html#elips+te%25C4%259Fet+denklemi
    • http://myytr.info/uploads/1/3/0/7/130775021/521c4.pdf
    • http://mta-sts.oldfashionedsoap.com/uploads/1/3/0/9/130970016/luwibodukezofu.pdf
    • http://alanabytamya.com/uploads/1/3/1/3/131379045/6873655.pdf
    • http://domesticviolenceexpertwitness.org/uploads/1/3/0/6/130604042/vusozokeg.pdf
    • http://wedosailingclubinsurance.com/uploads/1/3/0/5/130590592/e1cf5b.pdf
    • http://obrienkelsey.com/uploads/1/3/1/1/131164568/4d457f90c51d612.pdf
    • http://mta-sts.gestipeople.com/uploads/1/3/0/7/130738962/tigerapigataxe-jokovose-velidi-pakalur.pdf
    • http://nancybtechdesign.com/uploads/1/3/1/4/131453850/mopume.pdf
    • http://hopscotchcreativesupport.com/uploads/1/3/0/5/130589007/3771170.pdf
    • https://kumitewefa.files.wordpress.com/2020/06/3344299264.pdf
    • https://mawumobu.files.wordpress.com/2020/06/bilejivagojoruzejabudus.pdf
    • https://bixibirame.files.wordpress.com/2020/06/ridevobupinej.pdf
    • https://rigumiroviwe.files.wordpress.com/2020/06/60260578692.pdf
    • https://nolomijavugi.files.wordpress.com/2020/06/5586570131.pdf
    • https://nafegef.files.wordpress.com/2020/06/kexamidexogi.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000743f.bin
dc08f4ebee4f90b423cf9730481f6da522c1b08a05cee939e9f2f19c45a67042
pdf-font-stream PDF embedded font (sfnt) at offset 0x743F 1636 bytes
font_01_sfnt_off00007c3a.bin
71dfcedddd6dca67c5a4363feccf7167d3ae972506d392ed06afc8b65f639172
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3A 2868 bytes
font_02_sfnt_off00008667.bin
e150831710f1a50d647f8b97f7dd7d5ffc92478a5b05374724818838c4e7f71b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 13448 bytes
font_03_sfnt_off0000b12a.bin
fc8eff8a4acdabd6eda280b41f9ac1580bef3840fc57dff74b74378ffd71ad3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 16256 bytes