Malicious PDF — malware analysis report

Static analysis result for SHA-256 d559c86a68e037b2…

MALICIOUS

PDF

39.8 KB Created: 2020-03-30 04:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ea23621775ba49fd36a05fa8e32e5d9 SHA-1: 5be146d9da084424d98529a040f50b44b593f452 SHA-256: d559c86a68e037b274035631b56252f789f1d415f7e9a2c6723bc71aaee728f6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. No scripts were extracted from this sample.

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 http://shopbelfast.info/uploads/1/3/0/5/130589205/130589205.html#guias+de+matematicas+cuarto+basico+sumas+y+restas
    • http://teamtorian.com/uploads/1/3/0/6/130603917/bamofeweveruxovutav.pdf
    • http://shestealsdeals.com/uploads/1/3/0/5/130543941/903320.pdf
    • http://huhaf.com/uploads/1/3/0/4/130476207/3291243.pdf
    • http://correctivecare.net/uploads/1/3/0/5/130590019/b6db08552a15ddd.pdf
    • http://t2glifestyle.com/uploads/1/3/0/2/130271224/renutagetomubaso.pdf
    • http://8monthsinbrooklyn.com/uploads/1/3/0/8/130813554/geboxadilejiji_tutiwi.pdf
    • http://duplexdoctor.com/uploads/1/3/0/5/130588332/zawikulikutisad.pdf
    • http://webmail.beautysalon73.nl/uploads/1/3/1/4/131437625/toviwavenada-novalak-xodarase.pdf
    • http://bcroofingcompany.com/uploads/1/3/0/7/130739663/c19c11695a2824c.pdf
    • http://honors200malta2016.com/uploads/1/3/0/7/130775979/pikojosog-pifutune-pusizo.pdf
    • http://kimberly-garza.com/uploads/1/3/0/8/130874143/9935118.pdf
    • http://eaglecreekripleycottagerental.com/uploads/1/3/0/7/130776351/renemasite_laxulomigugi_zifanewe.pdf
    • http://blendednursing2017.com/uploads/1/3/1/3/131383497/mavebojekudetop.pdf
    • http://www.treeservicemoncton.com/uploads/1/3/0/3/130313480/wesanir_nirezuzodo_xewom_zesemuwibagozo.pdf
    • http://pearlbuilds.org/uploads/1/3/0/4/130435862/8501905.pdf
    • http://pennsylvaniafirepager.com/uploads/1/3/0/5/130590474/feputelafonopik.pdf
    • http://alikimccainart.com/uploads/1/3/0/5/130550898/8739b.pdf
    • http://lafourcheparishexplorer.com/uploads/1/3/0/8/130874289/704fc65.pdf
    • http://thespeakerslist.com/uploads/1/3/0/2/130289189/rutijupudiguzikavaw.pdf
    • http://zirconiaedu.com/uploads/1/3/0/2/130289353/272e768.pdf
    • http://coloradofoodhub.org/uploads/1/3/1/3/131378975/kimozez.pdf
    • http://kurzyhs.info/uploads/1/3/0/5/130588807/3d3d1e5.pdf
    • http://vivacecharlotte.com/uploads/1/3/0/6/130620807/84ac49e7edb.pdf
    • http://vivacecharlotte.com/uploads/1/3/0/6/130620807/
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007007.bin
50eed81d5b4846b70be0c706bc1240a1ff9efa2a17e9fdeab634e36829575fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7007 9064 bytes

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